"The Great Cloudwall" is [CloudFlare](https://www.cloudflare.com/), the world's [largest](https://w3techs.com/technologies/history_overview/proxy) MITM proxy([reverse proxy](https://en.wikipedia.org/wiki/Reverse_proxy)).
It is called this in reference to the [Great Firewall of China](https://www.comparitech.com/privacy-security-tools/blockedinchina/) which does a comparable job of filtering out *some* people from seeing web content(ie everyone in mainland china and some people outside) while at the same time those not affected to see a dratically different web, a web free of censorship of such images as ["tank man"](https://en.wikipedia.org/wiki/Tank_Man).
Cloudflare similarly prevents those in southeast asia and elsewhere who have poor internet connectivity from accessing the websites behind it(for example, they could be behind 7+ layers of NAT) unless they solve multiple image CAPTCHAs. Cloudflare also has a massive [harassment problem](https://web.archive.org/web/20171024040313/http://www.businessinsider.com/cloudflare-ceo-suggests-people-who-report-online-abuse-use-fake-names-2017-5). [Tor users](https://www.torproject.org/) and [VPN users](https://airvpn.org/topic/23090-cloudflare-often-bans-my-ip-address/) are a victim.
And their DNS service, [1.1.1.1](https://1.1.1.1/), is also filtering out users from visiting the website by returning fake IP address owned by Cloudflare or just return nothing. See NEWS.md for more information.
It is impossible to analyze without [decrypting TLS traffic](https://github.com/nym-zone/block_cloudflare_mitm_fx/issues/15#issuecomment-354773389). Cloudflare knows all your data such as raw password.
Cloudflare also offer FREE VPN service called "[Cloudflare Warp](https://blog.cloudflare.com/1111-warp-better-vpn/)". If you use it, all your smartphone connections are sent to Cloudflare servers. Cloudflare can know which website you've read, what comment you've posted, who you've talked to, etc. You are voluntary giving [all your information](https://github.com/privacytoolsIO/privacytools.io/issues/374#issuecomment-478686469) to Cloudflare. If you think "_Are you joking? Cloudflare is secure._" then you need to learn how [VPN works](https://en.wikipedia.org/wiki/VPN).
You might already know about the [PRISM](https://en.wikipedia.org/wiki/PRISM_(surveillance_program)) scandal. It is true that AT&T lets NSA to [copy all internet data](https://www.cnet.com/news/at-t-lets-nsa-hide-and-surveil-in-plain-sight-the-intercept-reports/) for surveillance. Let's say you're working at the NSA, and you want _every citizen's internet profile_. You know most of them are blindly trust Cloudflare and using it to proxy personal website, chat website, forum website, bank website, insurance website, search engine, secret member-only website, auction website, shopping. You also know they use Cloudflare's DNS service and VPN service for "_Secure! Faster! Better!_" internet experience. Combining them with IP address and RAY-ID will be useful to build internet user's online profile. You want their data. [What will you do](https://www.reddit.com/r/privacy/comments/1gb0pa/how_prism_actually_works_1520_att_fiber_optic/)?
* [Akamai said 0.2% of Tor exit nodes had malicious requests, yet CloudFlare claims 94%](https://twitter.com/musalbas/status/717316725973389313) [mirror](https://archive.is/1HkGl)
* Search something on [Searxes Tor](http://searxes.nmqnkngye4ct7bgss4bmv5ca3wpa55yugvxen5kz2bbq67lwy6ps54yd.onion/) or [clearnet](https://searxes.danwin1210.me/) (this will help collecting Searxes' "MITM domains")
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