This is just an idea, but I see that some instance prevent bots from bypassing the registration step by asking unexpected questions like “are you human?”. Apparently this is the type of question that can easily discern a human answer from a chatGPT answer. So what if the admin of an instance changed the question asked for registration application every few days? Something like " What did you hit for break f4st? " would give bot proof applications and the answers would likely give the admin a good laugh. Not 100% effective of course, but would help for the time being.
You can have a hidden form element and if an answer is present you know it’s a bot… Thats what I do on my site and it works pretty well… pretty easy to bypass though if you are a big target
That’s clever
Yup - some bots might detect honeypotting, so you’d need to change it every few days.