I haven't seen a whole lot of discussion around this and would like to hear people's opinions. Are you concerned about your posts being used for LLM training? Do you not care? Do you prefer that your comments are available to train open source LLMs?
(I will post my personal opinion in a comment so it can be up/down voted separately)
I think the claim is nonsense. If that were their concern they would rather change the usage agreement and maybe take some of them to court.
What they actually did is everything in their power to drive mobile users to their mobile app. They want old fashioned user tracking data for advertising and selling on. Together with more in app ads.