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Time to get serious with E2E encrypted messaging
(techcrunch.com)
This is a most excellent place for technology news and articles.
I'm with you on this, I strongly recall there was some sort of not fully open source portion of Signal at least at one point in time.
Edit: ya, they weren't updating server for awhile, so while there is an open source server, they definitely weren't running that code for awhile, and may not be running it today. Granted since the decryption happens client side, it shouldn't matter what the server does to some extent.
https://www.androidpolice.com/2021/04/06/it-looks-like-signal-isnt-as-open-source-as-you-thought-it-was-anymore/