Thanks to the anon that posted that screenshot of the Terms of Service PDF last thread, reposting it here. Also found the English version of theTOS page that the Japanese tweet was freaking out about
https://twitter.com/en/tosI have a layman's understanding of law so I have no confidence interpreting this, but what it sounds like to me is that while you still technically own whatever content you put on twitter, people are afraid that Xcorp asserting its right to use the content, especially to "adapt", "modify", or "distribute", opens the door for them to use it for machine learning. Or at least that's what the scare seems to be