Yes, had DS got into Durham he would have swerved catered accommodation - I seem to recall it added £2K onto the yearly cost? There is no way DS would have wanted three 'halls' meals a day (he doesn't eat breakfast for one), particularly given that he is still fussy about food.
I can see that it would work for mega busy students who don't want to be bothered with catering for themselves. Possibly those who have been at boarding school too, so for whom it's just a continuation of what they're used to.
I recall DSib who was at Cambridge saying that they had corridor friends who were incapable of boiling an egg on the one evening of the week when 'halls' food wasn't available (think Sunday evening).
How are all the self-isolating young people doing over the weekend? DN didn't sound particularly upset about the prospect as yet, although granted, it's early days (and most of the flatmates haven't had their tests as yet).