I don't buy it. Consumers sophisticated enough to care about the provenance of their beer are no doubt well aware that Blue Moon isn't a microbrewery. Consumers who aren't that sophisticated probably don't care, and (gasp!) simply enjoy the way it tastes.
The "right to know who I'm supporting" is the key there. I observe that for a lot of people these days, the brands that an individual purchases are a matter of reflecting (or establishing) that individual's own brand identity. "I use Chrome on a MacBook, because that SAYS something about me that using Chrome on a PC wouldn't.", etc. I understand that this is a thing, but like many I am more of a realist by nature and cannot relate at all. The most important factor in my purchasing decisions is cost-benefit ratio, with a generous amount of wiggle-room for subjective style considerations. However, I have zero fucks to give about what a purchase tells other people about my "identity", and am somewhat baffled by people who do. In my mind, if you're pretentious enough that you can't enjoy a beer without confirming its "exclusivity" from major brewers, then it's on you to pull out your phone and spend 20 seconds looking up the brewer on Wikipedia.