It will not surprise me if one day google will release its very own cryptocurrency but surely it will not be enough to beat bitcoin in terms of dominance and price in today's cryptocurrency market, even Libra coin which gotten really hyped ended up as a trash project.
Google already has its own currency
It is called Google Pay, Google Play Credits...
It is not a cryptocurrency , neither uses blockchain tech or whatever. It is like a PayPal
http://Https://pay.Google.comBitcoin has a different proposal
Google pay/credits are not even a currency. Google pay and Google Play credits are just payment methods/processors, not a currency it serves as a gateway so that you can buy products from different apps from the play store.