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Signal messenger blocked in Russia, says Roskomnadzor
(www.reuters.com)
This is a most excellent place for technology news and articles.
Just use the F-Droid version if there is any doubt.
Probably Russians who used Signal before.
The F-droid version is also not reproducible. The binary you install has a different hash than the one you build from the GitHub.
It's reproducible if you compare it with F-droid's tarball, which has all the source code in it.
F-Droid builds from source, so any suspicion whether the Google Play version has been tampered is completely irrelevant for the F-Droid version.