The irony of "do it for the exposure" is that everyone who actually wants to pay you in exposure isn't actually going to do that, either because they aren't popular enough to measurably expose you, or because they're so popular that they don't want to share the limelight.

AI is a unique third case in which we have billions of creators and no idea who contributed what parts of the model or any specific outputs. So we can't pay in exposure, aside from a brutally long list of unwilling data subjects that will never be read by anyone. Some of the training data is being regurgitated unmodified and needs to be attributed in full, some of it is just informing a general understanding of grammar and is probably being used under fair use, and yet more might not even wind up having any appreciable effect on the model weights.

None of this matters because nobody actually agreed to be paid in exposure, nor was it ever in any AI company's intent - including Apple - to pay in exposure. Data is free purely because it would be extraordinarily inconvenient if anyone in this space had to pay.

And, for the record, this applies far wider than just image or text generators. Apple is almost surely not the worst offender in the space. For example: all that facial recognition tech your local law enforcement uses? That was trained on your Facebook photos.