I have the application process enabled for people to join my instance, and I’ve gotten about 20 bots trying to join today when I had nobody trying to join for 5 days. I can tell because they are generic messages and I put a question in asking what 2+3 is and none of them have answered it at all, they just have a generic message.
Be careful out there, for all you small instance admins.
I think a reasonable approach would be to include little javascript mini games. “Score 50 or higher!” with no instructions provided.
edit: using a server side rendered canvas/logic, so no cheating. Damn, this is probably a million dollar idea.