It's true I'm assuming the author is being honest about what Cloudflare sent them and not leaving out a message where they made the situation abundantly clear. That's definitely possible, and we probably won't find out because big companies don't usually give public responses to this sort of thing.

name any other large provider that would behave differently

I can't, and this makes me inclined to believe it's a mistake to rely on any of them without a failover plan. Of course that's effectively impossible for some situations, like mobile apps requiring app store access. That seems like a situation that calls for antitrust enforcement.