Progressive web apps (pwa) are apps that are basically just a webpages converted into traditional apps. It's very easy for a developer to support multiple devices this way. The downside on Android at least is that when you access any page on your app it will log it in your web browsers history.

No it's the opposite most likely. Typical update procedure for anything of value is to perform a gradual roll out. You want to make sure that if any bugs are present in your major changes you aren't destroying your entire user base at once. You will still see some clients functioning for a few weeks until everyone is finally on the latest version.

Reddit not playing 4D chess and trying to get in your head with conspiracy theories. It's just standard software update procedure.