Smartphones allow such things. In fact, I wrote an app with an interpreter, ide, debugger and even its own app store, that was intended to build small programs

Smartphones allow such things. In fact, I wrote an app with an interpreter, ide, debugger and even its own app store, that was intended to build small programs (a few lines of js can do wonders). There wasn't a word of discouragement from Google. But very few people used it. I guess too much trouble.