Well, no. It is technically news brought to you by Microsoft. I suspect this is a phrase you will have to get used to typing in the future.
I agree, advertising does drive the industry. It is unfortunate, but journalism is ultimately a business. But I'd like to point you to one of the SPJ guidelines regarding ethics:
And hell, let's throw the part about accountability in there, too.
Can you honestly say Polygon is exemplifying all of these? Or even most of them?
Let's break this down - you received three quarters of a million dollars to produce a documentary about yourselves, something that has no journalistic benefit to anyone and exists only to advertise the now kind of funny notion that you are a new, revolutionary game journalistic outlet, and you received this money from a company you directly cover, ostensibly criticize, and have free reign to editorialize. Ignoring protests over the word "funny," am I correct that this is the reality of the situation? To put it simply, $750,000 were paid to your organization, from Microsoft, in order to subsidize your advertising?
Now, I don't know how much you know about the code of ethics, but I'm not an expert, and even I know this is grey at best. This is not a banner ad on your website to keep the lights on. This is a website that does not exist yet, taking money from one of the companies it covers, to advertise its impending existence. To compare this to coverage of CES sponsored by Ford misses so many rather important details that I am shocked you are either missing them or shocked that you would attempt to throw that ball over our heads and hope we don't notice. Either way, shame on you, seriously. Name-dropping advertisers as if the situations are comparable in an attempt to confuse the situation (or in an attempt to seriously argue it, in which case I don't even know how to respond to that level of fallacious assertions) isn't cool.
If you want to say, hey, we're not beholden to those rules. We just do games journalism. You know what? Go for it. More power to you. You are doing nothing out of your station, nor does anyone expect you to. But if the irony of producing a documentary about how you're raising game journalism out of the ghetto directly subsidized by a company who will be using you for box-quotes in the future is lost on you, then I feel you probably have more problems than simply how much said documentary costs.