How do notifications work in the official Telegram Android app (Play Store vs Site version maybe)? Does it have the same mechanism as Signal, which only recognizes the presence of notifications via Google services, but sends them via its web socket service?
Too radical a solution for me, I used microG for a long time, but the notification problems made me go back to Google services. i've banned them from accessing camera/microphone/geolocation via App Ops (put them on ignore mode), so I'm pretty calm. but notifications are still a problem).
No, they don't have the same privileges as root permissions. this is easily demonstrated by the camera app built into LineageOS when you enable ignore mode for camera in App Ops and it crashes. and google services also start making very untypical requests for access to stuff.
Yes, but there aren't many apps that respect privacy on my phone compared to the usual ones).