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Introducing Proton CAPTCHA | Proton
(proton.me)
Privacy has become a very important issue in modern society, with companies and governments constantly abusing their power, more and more people are waking up to the importance of digital privacy.
In this community everyone is welcome to post links and discuss topics related to privacy.
[Matrix/Element]Dead
much thanks to @gary_host_laptop for the logo design :)
Nothing is mentioned other than "proprietary system". Probably meaning that both ends are closed source. I don't see how I can verify whether it respects my privacy or not. I don't see a reason to implement this instead of mCAPTCHA, which is fully FOSS.