Never heard of minds, but Friendly Captcha is deceivingly source
available [1]. This is not apparent when you look at their main repository.
[1] https://github.com/FriendlyCaptcha/friendly-pow/issues/13
A previous commit [2] is free and it might still work.
[2]
https://github.com/FriendlyCapt
Given the recent conversation about Truth Social, as well as the fact
that social media are a topic of interest for the FLOSS community, does
anyone here use Minds?
The platform is free software, including server-side.
For a CAPTCHA, they use Friendly Captcha, which seems free client