Possibly but the main thing we find useful is the OTP generation. This means we can both use shared accounts without having to ask the other for a code. That’s probably an edge case, and not enough sites support it, but it’s really nice for the ones that do.

I doubt that is available in self-hosting but I’d be happy to be wrong about that. I have a raspberry pi serving up a couple of local things and I could register a domain if I had a use case for connectivity outside the house.