The GFW's robustness depends principally on suppressed citizen demand for uncensored information, not solely on access barriers. Calibration shows censorship remains stable even if the unencouraged access rate were substantially expanded, because low demand and moderate social transmission prevent information from reaching population-wide tipping points. However, censorship is fragile to demand stimulation: scaling the encouragement intervention to all students would, per the model, inform the entire student population.

When given a free 18-month subscription to a premium VPN (retail value US$25/month), only 55% of treated Chinese university students activated the tool, and less than 5% of active users regularly browsed blocked foreign news websites. By contrast, 86% activated a placebo free Youku (Netflix-equivalent) account within a week, isolating low demand—not friction—as the barrier.

§III.A, Table 2 evaluation

Acquisition of politically sensitive information produced broad, durable attitude change: access-plus-encouragement moved the median student from the 47th to the 56th percentile across all measured outcome dimensions. Students became more pessimistic about Chinese economic growth (elicited incentive-compatibly), more skeptical of government performance, more likely to plan exit via foreign graduate school, and more likely to report having withdrawn stock-market investments.

§IV, §III.C (Figure 1) evaluation

Peer-to-peer knowledge spillovers were statistically significant but small: a student who actively browsed foreign news and learned of a sensitive event made her dormitory roommate 12.7 percentage points more likely to answer a quiz on that event correctly. Model calibration showed this transmission rate is insufficient to propagate knowledge to the broader student population given the low share of initially informed students.

§IV.B evaluation

Modest financial incentives (US$2.50 per quiz requiring a visit to the NYT Chinese edition) produced a persistent increase in foreign-news browsing: after the 4-month encouragement ended, Group-AE students spent 3.4 min/week more on top foreign news sites than access-only peers (6.7 min/week among active users). By the experiment's end, 23% of newly exposed students paid US$4.50/month to continue uncensored access out of pocket.

§III.B–C, §II.B evaluation

Article 19 documents that Iran's National Information Network (NIN / SHOMA) was designed with explicit reference to China's Great Firewall as a model, with institutional mirroring: Iran's Supreme Council of Cyberspace parallels China's Cyberspace Administration of China, and both governments share a "cyber sovereignty" doctrine used to justify domestic content controls and cross-border technology transfer. The report frames Iran's filtering infrastructure as deliberately architected to replicate GFW capabilities, not as an independently developed system.

2026-article19-tightening-the-net §2, §3 dpisni-blockingdns-poisoningip-blockingbgp-hijackthrottling

Article 19 documents that Iran combines technical filtering with formal coercion of major foreign platforms (including Telegram, Instagram, and WhatsApp) to comply with content removal orders under threat of full blocking. The report notes that Iran's 2022 Women Life Freedom protests accelerated platform blocking when foreign operators refused compliance, demonstrating that the censorship system operates in two modes: coerce-and-allow for compliant platforms, block for non-compliant ones. Domain fronting via these platforms is therefore subject to sudden revocation if political conditions change.

2026-article19-tightening-the-net §6 ip-blockingdns-poisoningthrottling

The report documents that Myanmar's military has used its TSG-based infrastructure to execute targeted throttling and selective shutdowns of specific services and platforms, not only blanket internet shutdowns. This includes selective disruption of VPNs and circumvention tools during periods of civil unrest, demonstrating that Myanmar's censors have operationalized the granular per-service traffic control capabilities documented in the Geedge/MESA leak.

2025-jfm-silk-road-surveillance §5 throttlingip-blockingtraffic-shape

IRBlock discovered that 1.7M of 3.3M blocked apex domains (52%) were attributed to blanket suffix-level blocking rules rather than individual domain listings. Examples include regex patterns targeting all Israeli domains (.il TLD), adult content (.porn), and country-coded suffixes (.com.mx, .my.id). Of 87K Tranco-ranked apex domains analyzed, 37% fell into adult content, with entertainment and gambling following. Approximately 1.27M apex domains were jointly censored by both DNS and HTTP filters, while the two filters maintained operationally independent blocklists for a significant fraction of domains.

2025-tai-irblock §5.3 dns-poisoningip-blockingkeyword-filtering

For Tier 2 apps (IP geo-blocking only), using a VPN with a foreign endpoint was sufficient to restore access. For Tier 1 apps (SIM + IP geo-blocking), the authors confirmed that (1) removing the Indian SIM card and accessing via WiFi, or (2) intercepting HTTP traffic with a MITM proxy to suppress or rewrite the carrier_region=IN parameter, fully bypassed server-side censorship. The authors note that Indian users primarily rely on mobile Internet, making SIM removal impractical as a user-facing solution.

2024-gosain-out §4.3, §5 ip-blockingkeyword-filtering

After India imposed a permanent ban in January 2021, seven of the eight previously SIM-only-blocked apps escalated to dual-factor filtering: they continued extracting carrier_region=IN from the SIM card while simultaneously adding IP geo-blocking. Accessing these apps now requires both a VPN (for source IP masking) and SIM removal or carrier_region parameter suppression; MICO Chat remained the sole app using only SIM-based blocking.

2024-gosain-out §4.3 (Permanent ban subsection), Table 2 ip-blockingkeyword-filtering