And this is why, in my day job of an IT Systems Architect, I lean customers towards Amazon AWS rather than Microsoft Azure - MS can't scale quickly and easily to demand anything like as well as AWS and this kind of proves it once and for all. MS wanted to use their cloud infrastructure to show the world how awesome it was and they've kind of shot both feet off and proved the complete opposite.
I also happen to believe that stumping up £130 for a copy of a game should entitle you to be pushed to more "Premium" servers with less congestion. I'd go so far as to say that Game Pass users should be on a whole different set of infrastructure to those who have opened their wallets and bought the full game, with the higher priced versions getting access to progressively less congested servers and networks.
I've paid £130 for access to a game that someone else has paid £10 for as part of Game Pass (and even that assumes they only got GP for MSFS24) and potentially they've got access and I haven't? WTAH?