> On the one hand we happily train humans on GPL code. Those humans can then write their own functions,but for trivial functions they're gonna look a lot like GPL Source.

Exactly. People are getting mad that Microsoft is making good money while the people who made all that free software available mostly did it for free (like in no money and no recognition). It can sound unfair but that's the deal. If you didn't want people or AI to learn from your code, open source was not the right option.