Sounds like this is what they open sourced? So I don't really see the issue.

It was "source available", but licensed under their proprietary Bitwarden licence and not GPLv3.

What I mean is the problem is remedied now and was likely not the big deal people thought it was. Sounds like they packaged something into the software forgetting it was under a different license and quickly relicensed it. But this thread is framing it like they burned a bridge.