The cryptocurrency is a product derived from the blockchain. Ethereum has promoted the production of cryptocurrencies, so I think Google can do this kind of work easily!
But google not did not because of that reason. They said clearly in their statement that they are not against the cryptocurrencies but the actually cannot filter the scammers in the crypto currencies that is why they are going to ban. But I think it is now allowed as we can see advertisements of cryptocurrencies on google.
They have created various payment system and they will not create their own coin. They can do that even without any effort. Google has a lot of consideration before they wanna do something.
You should put this as the main concern that thing looks impossible to be happened