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Advice column: Why trust Signal?
(freedom.press)
This is a most excellent place for technology news and articles.
Desktop client does not even have e2e, lol. (I don't know if there are third-party options that do).
I'll freely admit I don't use that thing and was under the assumption it was feature complete. Regardless, the Android and iOS clients are also open, and I've found absolutely no indications that there's any blobs in the repo or the like.
From what I've seen, there are some blobs. At least Telegram-FOSS says:
Same page is where I learned you cannot register from third-party clients btw. Not nearly as big of a blow as removal of desktop registration, but still gross that you'd have to touch a partially-proprietary official app first.