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For a long time my go-to spam prevention solution was invisible fields like "username", "password" in the registration form -- if you fill them in, you must be a bot. It used to be very effective, but increasingly less so recently, probably because bots are now browser-based.
Now I'm using ad-hoc questions visible to users. Trivial to break if a human were to write a script specific to my forms, but that's not part of my threat profile.
Show your profile pic and ask what animal it is. See how long it takes for bots to pass it. Use SketchRNN to draw a new pikachu. Repeat
Make a torrent site, to download, it requires doing a CAPCHA. It looks just like RECAPCHA, but it's actually relaying the images from the target site, and then sending the answers your user provides.
The problem is that in some aspects the intelligence of the top end bots overlaps with that of the bottom end humans. It is very effective however this makes it difficult to use humour as a bot trap, unless you also want to block stupid humans with no sense of humor.
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