Why not a NIP that would allow relays to ask for a crypto captcha solution before they accept a message?
Something like https://github.com/mCaptcha. That would make it expensive to run spam bots, without annoying normal users.
Discussion
Are you really prepared the captcha selection of semaphores 🚥🚦and busses 🚌🚍 each time you wanna post something..nope not me.
I guess you didnt look at the link I posted. Crypto puzzles are solved automatically by the app without human involvement, no semaphores and no busses.
Oh excuse my ignorance 🙂 I did check it but the pow can easily be manipulated if set to easy. If set to too difficult, we all have a problem with posting.
What this is doing is just randomly guessing numbers and when hitting one with enough 0s then it's a pass and this can easily be manipulated.
That would be interesting 🤔