I am a Google customer. They provide me with a product (Google) which I pay for by allowing Google to display advertisements on the results.
A business is also a Google customer. They pay Google to display ads to a visitors to the website.
But that distinction is moot anyway. Businesses aren't covered by consumer protections because they aren't "consumers".
You're really a user; not a customer. Customers pay. Google is selling your eyeballs to advertisers. Advertises are Google's customers.
And the important distinction if you want to counter the argument that the person you're replying to is making:
Customers pay with money. "paying" with a currency like privacy or convenience isn't actually paying. If you aren't paying for something with money you aren't a customer, you're a user.
Rest assured that if you were a google customer, the IRS would want their pound of flesh from that barter exchange you and google are having.
Right now the only (supposedly) viable competitor is Facebook, but it's more of an advertising duopoly that divides the market - all the people I know who advertise say that you use FB for brand/interaction/marketing and Google for sales, and for a specific spend it is usually clear which one gets it (and seldom if ever anyone other than FB or Google).