What do you mean? Has Google patented the use of computer-generated voices / language to contact a business?

No (or perhaps yes), but they are a big player, and this is a typical winner-takes-all situation. Soon everybody will access business X through Google, and this gives Google power over these businesses, just like Amazon has power over third-party sellers, for instance. For the consumer it means a minor convenience, but for the business-owner it means tougher competition, and loss of identity of their business. It's like selling software for years, then suddenly Apple comes along, "forces" you to use the AppStore, and demands a cut.

In short: the problem is that a company now regulates your market.

Ideally the other end would not rely on the phone, but so long as they do, yes. Anything to remove it from the lives of the rest of us is a good thing.