I've used KeepassXC + Syncthing for about 8 years now, and it works fantastically. Syncthing provides redundancy, syncing, and versioned backups. There's a merge function with conflict resolution in KeepassXC on the off chance two copies get out of sync with each other after a long period without connectivity. I have full control over where my data resides, and the source code of the entire stack.

The only other stack I've used is on-premises Bitwarden for small businesses, because it provides a more flexible multi-user permissions model. That can be made fully self-hosted and open source by using Vaultwarden for the server.

I don't see any advantages to using Proton Pass over those, frankly.

I mean, Its just marketing. Everyone knows how BS marketing always is, be it whatever company or product. I feel we should just take statements by marketing teams of companies with a grain of salt and just move on. Bringing the issue to light is not a wrong thing to do but I personally felt keepass's tweet felt quite confronting to me. Maybe it's because I'm not familiar with twitter culture. Who knows... Just my 2cents

The marketing of any online synchronized password managed can NEVER be even close to safety of keepass. We've seen their 13 foot walls break so why present you've invented the next best thing. Just stick to keepass and don't worry.