I see lots of reasons being proposed, but my guess is that they want or need to avoid content being scraped by AI related companies and researchers.
They already did.
> . . . then I won’t like that.
There is no universe in the multiverse where Microsoft or one of its subsidiaries gives a single flying fuck. Something about those who forget history being doomed to repeat it . . . .
https://www.reddit.com/r/ChatGPT/comments/10j531u/i_made_cha...
And also, what is stopping the scrapers from creating a bunch of accounts to scrape with, and rotating them once they get banned?