I wouldn't go so far as to say a backdoor, but I do see them removing apps at Trump's behest. In fact they've already done so (and so did Google), the ICE stuff.

The future isn't apps that are curated by an app store, it's on the web where they can't easily control it. They'll need to block it at the network level, but a VPN could get around it. Then it's 100% on the user.