Real reason: The Guardian can't handle when readers community note them using.. The Guardian. https://twitter.com/MarioNawfal/status/1821189070401249385/p...
This. It's not just The Guardian, though. It's pretty much all moss media. They got too used to an era where they could talk and the public couldn't talk back (or they could but only through letters to the editor which they could conveniently filter to just the voices they wanted to hear).
What they filter out is the utter crap that invariably comes to completely dominate any unfiltered comment section that is open to the general public and takes effectively anonymous submissions via the internet.