Pull request #10974 introduces the @bitwarden/sdk-internal dependency which is needed to build the desktop client. The dependency contains a licence statement which contains the following clause:
You may not use this SDK to develop applications for use with software other than Bitwarden (including non-compatible implementations of Bitwarden) or to develop another SDK.
This violates freedom 0.
It is not possible to build desktop-v2024.10.0 (or, likely, current master) without removing this dependency.
None of that makes Bitwarden not open source. Not only that, they specifically state this is a bug which will be addressed.
I would go as far as to say that Bitwarden’s main competitive advantage and differentiation is that it’s open source. They would be insane to stop that.
Yes, it does, because it violates its own license GPLv3 by having proprietary build-/runtime dependencies.
If it was under a different, maybe more permissive, open source license, then maybe it would still be open source, but as of right now i likely breaks its own license terms.
From what they state, they think that because executables that share internal information via standard protocols does somehow not break GPL3 terms compared to two libraries that share internal state via the standardized C ABI which does. And they seem to not consider that a bug, just the build-time dependency.