Real reason: The Guardian can't handle when readers community note them using.. The Guardian.
https://twitter.com/MarioNawfal/status/1821189070401249385/p...
Twitter could make itself real interesting if it took "community notes" web-wide. So many attempts at this have tried and failed, but Elon may just have the itch, audience, and disposable money to do it. Would also necessitate forking a special browser, since there would be no way to support web page comments in a first-class way in stock mobile browsers.