Running a bug bounty is not the same thing as getting an independent security audit.
That's quite the understatement.
Re:1Password for Open Source Projects
by davidcuddeback on Wednesday April 11, 2018 @09:23PM
(#16817295)
Yes, but there's discussion in the issue that I linked to about raising funds for an independent audit.
[1] https://github.com/bitwarden/core/issues/27
[2] https://hackerone.com/bitwarden