In the United States, absolutely not. See, for example, 15 USC 45(a)(1) which says, "Unfair methods of competition in or affecting commerce, and unfair or deceptive acts or practices in or affecting commerce, are hereby declared unlawful.".
I challenge anyone to argue with a straight face that contracting to provide a service and then failing to provide it in the manner expected for no reason whatsoever, causing harm to the consumer despite being able to avoid that harm, is not unfair. You would have to argue that the word "unfair" means nothing at all.
In fact, this perfectly meets the standards for unfairness because:
1) It causes harm to consumers.
2) Consumers cannot reasonably avoid the harm.
3) It is not outweighed by any countervailing benefit.
That is essentially the legal test for whether a business practice is unfair.
Regardless of what the contract says, United States law prohibits a business from adopting a practice that causes unavoidable harm to consumers unless there is some benefit from that practice that outweighs the harm. In effect, it prohibits businesses from being manifestly unreasonable.