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So, Cloudflare analyzed passwords people are using to log in to sites they protect and discovered lots of re-use.

Let me put the important words in uppercase.

So, CLOUDFLARE ANALYZED PASSWORDS PEOPLE ARE USING to LOG IN to sites THEY PROTECT and DISCOVERED lots of re-use.

[Edit with H/T: benjojo.co.uk/u/benjojo/h/cR4d]

blog.cloudflare.com/password-r

benjojo.co.ukbenjojo:It feels quite uncomfortable that cloudflare is somewhat openly admitting to analysing login credentials that are going through the reverse proxy, and providing...
Karl Auerbach

@0xF21D In addition, remember that Cloudflare offers DNS resolvers at the 1.1.1.1 IPv4 anycast address.

Being in the position of the a users DNS resolver opens up all kinds of possibilities for manipulation of the returned resource records. (It's been a many years since I played with DNSSEC, so I am not sure whether DNSSEC could provide protection.)