Epic: Captcha/anti-bot

Possible solutions:

• mCaptcha https://github.com/mCaptcha/mCaptcha
• Google's invisible recaptcha

this would get triggered randomly on users based on a variable (maybe specific to a user?)

google's invisible recaptcha would be the most non-UX-invasive but obviously privacy invasive

mcatpcha would be slightly UX invasive as it prompts the user because of the proof-of-work it uses, which going this route would be privacy respecting

mcaptcha also might not stop any botters due to it just using more energy/processing power to run those checks

could have a way to switch between them on the fly? or maybe per-user moderation actions to switch between the two