Update: for some reason, Obsidian works again (had also issues with Finder BTW)
I remember having similar issues after enabling iCloud (somehow crash the computer :), maybe too many things to back-up). I cleaned a bit of my storage (almost full, Docker takes crazy amount of storage…) and things went better.
If all of those sync services are syncing the same files to the same devices, that’s likely to cause problems (tho this isn’t one of the problems I’d expect).
I have experienced the same issue in the last week, especially when renaming files and then Finder freezing out the whole Mac. I think in my case it is something to do with the vault being stored in iCloud.
I have gone so far as to wipe my Mac and clean reinstall everything. Still got the same problem.
I suspect this is down to Apple. I don’t have an Apple device that isn’t problematic these days.