Pre-ChatGPT datasets will become prized commodities, this sort of AI will be trapped in a stasis of pre-2023 pop culture as subsequent AIs will need to use datasets that hadn't yet been contaminated by pervasive ChatGPT spam.

It will be like low-background steel, steel that has somehow been isolated from atomic fallout form the mid XX century onwards, and must be used for radiation-sensitive equipment: https://en.wikipedia.org/wiki/Low-background_steel

Except somehow worse, because it's just steel, this is culture.