I’m not familiar with AWS myself, but they seemed to be referencing something they vaguely characterized as ‘security infrastructure’, kind of as a handwaving for why they thought it made sense to be single point of failure because to enable distribution of it would somehow be insecure…

I frankly wasn’t interested in delving deeper, because that excuse sounds pretty stupid, but I’d be trying to get details I don’t personally need about something I probably shouldn’t be arguing about. I’ve gotten burned too much by someone championing something stupid ostensibly in the name of ‘security’ to try to sign up for another one of those arguments.