Google is sitting on the "but they're contractors!" angle because it makes it easier for them.
Why?
Because once the union does collective bargaining with their actual employer, Cognizant, the company will have almost no recourse but to increase fees to Google for the contract work.
Once this happens, Google just says "Oops, you're shit out of luck" and then hires a whole new company of contracted workers for the same work, for cheaper.
Google purposefully uses this type of structure to ensure they never have to pay more, even when collective bargaining with unions does happen. Because then they can just shitcan the whole company and claim costs were too high. They certainly won't break their contract, but you can bet your ass when time comes to renew it, Google will have found someone new to take their place.
It sounds like your job requires no talent and you could be easily replaced. Is it so?
Just because there are other people out there who can do the same job as you (or them) doesn't mean that it takes no skill, nor that replacing them can be done at a snap of the fingers. But nobody is irreplaceable. That's how companies see their employees. Even you.
I really didn't think we would ever see a return to the days of the robber barons. Now I think that era was but an open mic amateur hour opening for the headliner that's coming.
When it comes to their workers, the Big G does learn its lessons. That's why it's so able to keep screwing them over; they reason from the standpoint of "how do I make this not affect me?"
A Google spokesperson told Motherboard in a statement at the time of the unionization that it had “no objection to these Cognizant workers electing to form a union,” but that it would not bargain with them. “We are not a joint employer as we simply do not control their employment terms or working conditions—this matter is between the workers and their employer, Cognizant,” the spokesperson said.
NLRB seems to disagree. This will be an interesting case, I suspect ...
The U.S. National Labor Relations Board on Friday resurrected key elements of a policy it eliminated more than 50 years ago requiring businesses that commit labor law violations to bargain with unions without holding formal elections.
It's Google's platform, Google's customers, and Google's profit. Of course Cognizant should be considered their employer, they're setting the foundation for literally everything they have to deal with.