There's no easy solution to this, because people who aren't doing stupid shit like that are still getting caught in the crossfire.
I don't envy your position. Its the main reason I haven't started a community, even though I've had the itch to make a proper modded minecraft and kratom communities.
I do get it. You have to protect your community first and foremost... I just wish there was a better solution. I've been thinking and thinking about it and coming up empty, tbh.
Takes a lot more to fully deshittify it, though. I've been down that road. So much registry diving, so many third party apps, strongarming uninstallations of bloatware through brute force, and just all around weeks of work.
When the screenshot shit was announced the first time, I just got tired of looking for workarounds to disable or remove Microsoft's active attempts of policing, spying, and triple-dip profiting off it's paying customers.