AFAIK, Signal does not want anyone to use alternative clients, has that changed?
As far as I know moxie, signals lead dev, considers only the use of the officially build and distributed client authorized to use their servers.
So if they ever manage to detect someone using their services with an alternative client, they might delete your account.
Now they will likely spin any critique and demonstrations against the AfD&CDU as "influenced by russia".
And long term CDU voters will eat it up, since "russia is on the extreme left" or whatever.
We live in an inverted world it seems. It looks like making stuff up is more difficult then just inverting facts.