[AshamedCaptain]

> However, there is a difference with Android: iOS was crippled from the start, but first iterations of Android were relatively open, apps could run in the background without much issues. But then Google started tightening the grip, so Android now closely resembles iOS in this regard

As far as I know, Android still allows background applications though. The only constraint is that you have to show a persistent notification (that the user can hide). IM clients like Conversations.im will attest to that.

(iOS does not -- and thus creating a real Jabber client that does not depend on push notifications is impossible)