between this and atoms the future for immutability is looking great

You can but you would have trouble gaining activity since the biggest attractor for new users is activity and it it would be difficult to get that initial momentum with such strict posting guidelines. If you had an established userbase though it’s a great idea.

The only one I see linked often is tilvids.com. There may be more popular ones though.

That’s really good advice it helps me a lot

If this was to be a feature then it should be linked to the lemmy instance itself, lemmy communities shouldn’t auto create rooms on matrix.org. Also It wouldn’t make sense to add something like this unless lemmy had deeper matrix room integration even if it was barebones.

yep especially KDE connect which is just about perfect for syncing files between devices