What are open alternatives at this point?
As far as I can tell, the only competitor with a similar feature set that even claims to be open-source is Proton Pass. But I can't find any information on whether the server side can be self-hosted.
IMO, the secret to keeping the passwords synced with KeePass, is to make sure your client has a direct feature to sync the passwords database to a remote server - SFTP, DAV, SMB, etc. Then all you need to do is to set up a single remote file share to serve that file. Or sync manually, assuming your passwords change slowly - KeePass 2 can sync changes automatically between KDBX files.
While there seems to be an alternative, the root cause of Google's hostility to foss apps does not make me optimistic about this being a stable solution in the long run :(
https://forum.syncthing.net/t/discontinuing-syncthing-androi...
here’s an older of comment of mine for more details: https://news.ycombinator.com/item?id=36022210