... and this has what exactly to do with Itch??
If you have business dealings with google, like selling on the playstore, they might send you stuff like this. Otherwise, this sounds like a phishing attack.
Also, to be technical, you did not receive it on your smartphone. You received it on your email account. If you received it "on your smartphone", I would be extra sceptical.
---
Or, translation issues again, did you per chance get an email from itch to your email adress, that just happens to be a gmail adress. If so, please do not confuse the sender of the mail with the isp that you use for email.