Google allows email suffices a la my [email protected].
So you can use different email addresses for different accounts while having only one Gmail account.
Little trick: You can also randomly insert dots in your email address, a bit more stealth and compatible with more sites :)
I tried this for a little while but quickly stopped as a critical mass of websites broke when I tried using it to sign in. Special characters in your email address is an edge case that produces inconsistent results even within a single product