That depends a lot on how the license gets interpreted and how license violations are handled by the local law. The argument for why the end user cannot do anything about GPL violation is that the violated contract is between upstream and the “bad” developer - the upstream project gave the bad developer access to their source code under the condition that the license stays the same. You as the end user only get exposed to the bad developer’s license, so you can’t do anything. It’s the upstream who must force them to extend a proper license to you.
However there was also a case recently where the FSF argued that this interpretation / handling of the situation is against the spirit of GPL and I think they won, so… Yeah, it’s just unclear. Which is normal for legal texts (IMHO intentionally, but I’m not here to rag on lawyers, so I’ll leave it at that).
Licensing the source as GPL doesn’t really force the copyright holder (which is 100% BitWarden due to their Contributors Agreement^*, no matter who contributed the code) to do anything - they are absolutely free to release binaries built on the same codebase as proprietary software without any mention of the GPL.
For example if I write a hello world terminal program, release its source code under GPLv3 and then build it and give the built binary to you (and a permission to use it), you cannot force me to give you the source code for that build because I never gave you a GPL licensed binary.
If you were to take my GPLv3 source code and distribute a build of it however, you would have to license your binaries under GPLv3, because that’s the terms of the license I provided the source code to you under. Your users would then have the right to request the source code of those binaries from you. And if you released the build under an incompatible license, I (but not the users) could sue you for violating my license.
License violations are usually not resolved by making the violator comply retroactively, just going forward. And it’s the copyright holder (so BitWarden themselves) who needs to force the violator to comply.
^* this is the relevant part of the CA:
It is followed by a workaround license for parts of the world where copyright cannot be given up.