I don't think your understanding of Fair Use matches mine, but it is important, since it invalidates the concern about licensing.

I wrote a nearby comment giving some resources on the current state of Fair Use for training, but in short: it depends.

https://news.ycombinator.com/item?id=48125071

> Hence, as an outsider, the court rulings have no weight in my eyes.

My only focus in on legality, so this doesn't track for me. If we're not talking about what courts are ruling, then there's nothing to talk about legally, since the copyright office is waiting on courts to rule here.