Nope, big companies don't get their money from thin air, they get it from the consumer. Company expenses === consumer cost.
And even if they did, it wouldn't make the internet cheaper for you - it'd make it "not more expensive". Getting rid of net neutrality will give ISPs and such more tools to make the internet more expensive.
It's not that simple. Google could build a fiber network itself. If it's more efficient, wouldn't this allow Google to lower prices for their own services? Also if Google didn't connect to every consumer, Google could lease lines to ISPs and other businesses. As a result, there would be a complicated market, and consumer data would be subsidized by other businesses indirectly.
And even if they did, it wouldn't make the internet cheaper for you - it'd make it "not more expensive". Getting rid of net neutrality will give ISPs and such more tools to make the internet more expensive.