Google does encrypt user data at rest. The problem is that they also have the decryption keys. They need to be able to see the data in plain text in order to target ads and improve their services. That's their entire business models. So, there is pretty much zero chance that Google will ever "implement some real encryption and decentralization in its services." If we want a Search Engine/Email Provider/Video Sharing Service/Thousand Other Things Google Does that is decentralized and encrypted client-side, it would have to be built by a different company or community with a different mission and profit model.