However, Vaultwarden only implements the webvault, the client apps are still only supplied by Bitwarden, which they could make incompatible with Vaultwarden at some point.

Regarding Lasse Collin, technically he did eventually open a liberapay page where people can donate to him, though it’s only at €60/week as of writing.

I don’t care about photos, hardly take any, so can’t give you an exact answer, but I assume self-hosting is the best approach.