I couldnāt find a CAPTCHA solution that satisfied me, so for now Iāve implemented my own. The main advantage is that itās fully internalānothing is sent externally, no cookies, sessions, or similar mechanisms are used. Privacy is 100% preserved. The downside is lack of accessibility for visually impaired users (Iād need to generate audio on the server). It should slow down bots, but anyone determined to create multiple accounts still can.