The Bitwarden web client has actively broken Vaultwarden compatibility at least once <https://github.com/dani-garcia/vaultwarden/issues/7607>. It’s reasonable to expect they’ll do so more, carelessly or deliberately. They already have features and UI that don’t make sense for Vaultwarden, and the rate of such things feels to me (as a mere user) to have increased. When Bitwarden continues in the direction they’re going, I think a hard fork of the entire ecosystem for Vaultwarden is fairly likely, and it will almost certainly be a good thing, and in hindsight we’ll probably wish the fork branched off earlier.