I found something interesting today - tar pits for bots. Bots go in, they get stuck looking at gibberish, and never finish.
https://arstechnica.com/tech-policy/2025/01/ai-haters-build-tarpits-to-trap-and-trick-ai-scrapers-that-ignore-robots-txt/
This site bans several bots, but if the bots ignore the ban, then the tar pit is another option.
I wonder if the bot count would go down if they were disallowed from /off-topic-discussions?