Stack Overflow bans users en masse for rebelling against OpenAI partnership — users banned for deleting answers to prevent them being used to train ChatGPT
Is there an actual way to stop it? I don't think so. At least, moving to the fediverse would stop any particular corporation from having the monopoly of it, prevent reddit-like abuse of power, would give users more power, among a few other things.
How restrictive do you want to be with the accounts? If you're too restrictive, there won't be enough users. If you're not restrictive enough, the data will be used for AI training.