I don’t know which is why this is completely up for debate, Office also offers grammatical corrections and you have websites like Grammarly that do the same often without any “AI” as far as I know.

Like with anything else this is something that would require society to come to a consensus.

And there are various issues with AI assisted or generated content depending on the context. For example educational institutions may see this as cheating whilst corporate entities might fear legal challenges in relation to copyright and IP.