Non-sarcastic reply:
Horseshoe theory isn't so much about "the far-left is the same as the far-right" as it is about "all authoritarians derive power from the same human instincts" and the further left or right you go, the more authoritarian you have to be in order to achieve the social narrative you're aiming for.
Edit: misplaced word
There are lots of good reasons to be upset with how Signal produces builds. And maybe Signal has no good reason why they keep opaque dependencies. But by every common definition of the term, Signal is open source. Being on FDroid is not the definition of open source.
Please don't gatekeep. There are better ways to criticize Signal. This is not one of them.