Real reason: The Guardian can't handle when readers community note them using.. The Guardian.
https://twitter.com/MarioNawfal/status/1821189070401249385/p...
replies(10):
https://twitter.com/MarioNawfal/status/1821189070401249385/p...
Thus, they tend to reflect the biases of the kind of people who most want to (and have time to) write and approve community notes, drawn from the pool of people who use your site.