Keyword… unlock, not add information or use them offline where they can sync to an open source backend. They are cloud-based password managers that are designed to operate online. The backend is not open source. It is designed to lock you into a walled garden.
The unlocking happens locally. it’s simply decrypting. also, i think you can export the data from proton pass.
it’s a cloud solution. keepassxc works great and I don’t know why you want something else to replace it
Browser integration with quality biometric login is a beautiful thing. Keepass’ implementation of both is trash, and keepassxc’s browser integration may actually be worse than the original.
That having been said I always recommend to people they use two managers, with keepass being the secure base for things you don’t often need convenient access to like savings accounts, password manager passwords, tax services, etc.
bitwarden, proton, et al I use for the day-to-day…I don’t give any fucks if my Lemmy account is lost for example.