Yeah, by what definition aren't they? Like any popular high-demand product they get to name their price.

But no gmail user is in much higher demand by google (or their advertizes) compared to any other. The generic gmail user is more like dime-a-dozen no-name bands that don't have even a whiff of the negotiating power against a label that the Stones do by virtue of being the Rolling fucking Stones.

s/gmail/whatever "you're the product" service in question/