disclaimer: I haven't actually looked... but...
Historically, it is those large "complete collection" torrents that survive on public trackers... and probably still exist.
Thus, (sorry to be blunt) why I think this project wouldn't really provide a lot of "additional value".
I use 1Password at work. It pretty much ticks your boxes. With 1Password, a collection of passwords are referred to as a vault.
As the OP mentioned, it "just works" with everything.
My only gripes with it is that it's a bit cumbersome to log into the website (you basically have two passwords, plus mfa)... but if you've got the browser extension installed, it's painless. The other gripe I have is, it's tricky to have an overview of what passwords/vaults already exist. So, if you have enough people, it's inevitable that passwords will be accidentally duplicated - and no one will have a clear idea what was duplicated and who has access to it (unless you're a member/owner of a vault).
You mentioned you wanted something "hands-off", I think that after the initial setup, you'd get just that.