Maybe (I can't emphasize enough that I say this with a high degree of skepticism) they'll come up with a way of doing cited/credited/paid work where the LLM will include who "taught" it something.

Eg: instead of writing a blog post, you'll submit a knowledge article to an AI provider and that'll go into the AI's training set and it'll know "you" told it. And maybe (even more skeptical) pay you for it.

Again: highest degree of skepticism, but at the same time, that's the only way I could see people continuing to write content that teaches anything.

This will only happen as an absolute necessity, for example if the EU threatens massive fines or the US antitrust people grow some teeth.

Even then, you'll get malicious compliance. The best case scenario would be a bit like Spotify: everyone getting fractions of a penny.

Agreed. I'm particularly pessimistic about how this will play out.