In general, I think any human generated content in pre-2022 is valuable because someone did some kind of validation (think about stack overflow answer with user confirming that a specific answer fixed their problem).

If they start to feed the next model with LLM generated crap, the overall performance will drop and instead of getting a useful answer 1 of 5 it will be 1 of 10(?) and probably a lot of us will cancel the subscription ... so in the end I think it matters.