Something along the lines barring the compilation of iOS apps with 3rd party tools or some such in TOS or blocking apps made with them from the App Store outrig

Something along the lines barring the compilation of iOS apps with 3rd party tools or some such in TOS or blocking apps made with them from the App Store outright. Not saying the would, but if they had reason to fear they are losing control of something in their ecosystem, no telling what they would do. Just would not give a zero chance of something crazy as such happening.