"Login With Google" feature is made for people who don't know how crypto wallets works but also don't want anyone other than them to access their funds.
It encrypts your wallet with random entropy (not known by Google) and backups it to your Google Drive. So neither Google can access the private key nor does Incento. Only and only user have access to that key.
Login With Google enables you to use the same wallet on every device.
When you login with Google you are asked to register username for yourself. Forget long weird crypto addresses people can pay you just with username.