Bitwarden is still releasing free builds but yeah you'd need a new project with a new name to use it from the Play Store or App Store.

Turns out Keyguard, an alternative Bitwarden client is already on the Play Store.

https://github.com/AChep/keyguard-app

Edit: turns out Keyguard is source available but fully copyrighted.

The question is, what structure can protect this in an ongoing way? Say you setup a non-profit foundation, even those seemingly can be perverted to become for-profit businesses with corporate shenanigans (see OpenAI), so if you wanted to somehow "guarantee this group always release things this way", is there any legal structure that can enforce this somehow, "forever"?