Originally I've download the signal app through playstore, but often it also get updates from Droid-ify(Fdroid client). Today its weird and I got this . Explain to me this.
On the Droid-ify the signal app is provided by: org.thoughtcrimes.securesms
Didn't notice the "droid-ify" part, whatever that is. Install apps from trusted sources like F-Droid or dev's website and you don't need Google to scan your phone and tell you what you can or cannot install.