There are lots of ways to do this, to have third-party "app stores" or different binary formats for apps (e.g. WASM, JVM/CLR bytecode). All that would need to

There are lots of ways to do this, to have third-party "app stores" or different binary formats for apps (e.g. WASM, JVM/CLR bytecode). All that would need to happen is Apple to allow sideloading apps. Then the only limit would be developer creativity.