I'm sorry, can everyone not read the actual link? They specifically say they are not training generative AIs, i.e. LLMs.
They are using the data to train non-generative AIs for stuff like emoji and channel suggestions. I.e. "you use this emoji a lot, so it's displayed first" or "people that are in these channels of yours also join these other channels you're not in yet".
This is class A misinformation being spread here, good job. It's unbelievable that I'm the first one to actually verify the truth of this post, because I wanted to share it further and that's what you do before.