People tend to forget we are Google's product. Not their customers. Advertisers are their customers.

Plenty of tech companies don't sell souls for a living, therefore by working there you may not be required to also sacrifice yours for a paycheck.

Flip side; there are those who believe ads aren't evil. Google builds a lot of interesting tech. It's probably a great place for engineers. But one look at their financial reporting and it's still evident that advertising pays the bills.