Storing 2FA codes is just the beginning. Bitwarden aims to add defense in depth to authentication.
Bitwarden Authenticator is a standalone app that is available for everyone, even non-Bitwarden customers.
In its current release, Bitwarden Authenticator generates time-based one-time passwords (TOTP) for users who want to add an extra layer of 2FA security to their logins.
There is a comprehensive roadmap planned with additional functionality.
Also they have weird behind the scenes integrations into accounts even if they are just supposed to be regular 2FA. You can read stories about Twitch not playing well with other 2FA until 30 days after you remove Authy. I don’t want those kind of shadow integrations and I should be allowed to switch apps as I see fit
I guess for me, it being closed-source and the fact that the Bitwarden password manager and now Bitwarden authenticator are open source. Truthfully, I just see how they handled the desktop version of their Authy software, giving no fucks if consumers wanted it or not, being a big red flag of what could come after. Having used Bitwarden for years now, and giving them $10 a year, makes me more biased and inclined to use their other software, since they've never let me down. :)