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Can they? First they'd have to never have accepted contributions, then if they ran an updated version on their server wouldn't they be in vialation of AGPL (not providing end users, in this case specifically those who use Signal an updated codebase).

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They have a CLA, the legal side of things is clear. They can use their code however they want, the licenses are only relevant for others. When you contribute, you basically license your code under a permissive license to Signal (because of the CLA).

If they have never accepted contributions, then they are the sole copyright holder, and thus can do whatever they want with the code. Including not providing the source code to users.

You can't sue the copyright holder for infringing their own copyright.

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