Just to be clear, Bitwarden could autofill before, even automatically (if you are daring), it just didn’t have an inline button in the form fields that you could click on. That’s what they’ve added now.
From personal experience, Bitwarden has been really mature about not kneecapping self-hosted users. Especially compared to other ventures like Standard Notes. They offer value by taking out the difficulty of running your own server, not by making it artificially difficult to set one up.
(I could be giving them a little too much credit, because Vaultwarden is a community driven effort, but I specifically watched SN make it harder to install third-party extensions if you don’t pay them monthly.)