I don't see why it's "not acceptable" at all. Why shouldn't they treat users this way? They can make more money with all these annoyances, and the people who hate it are just going to complain on internet forums and keep using Windows anyway. Seems like a good business strategy to me. Any time a business is in a position where they can abuse their customers endlessly and the customers will refuse to leave, it would be a breach of fiduciary duty not to abuse them for more profit.