As the name suggests, all the breweries involved, save for one (the host), are gypsy brewers. The Brewers Association (BA) defines this type of brewery as a contract brewing company—essentially a business that hires another brewery to produce its beer. The contract brewing company is often responsible for recipe development and handles the marketing, sales and distribution of the beer. “Not-owning a physical brewery doesn’t stop us [gypsy brewers] from being extremely passionate, innovative and community-minded,” notes Band of Gypsies ring leader, Ashley Routson of Bison Organic Beer. “Our mission is to work together to promote and celebrate each other, and educate the craft beer community on the world of gypsy brewing.”
Now call me goofy, but I do think words should have meaning and my understanding that a contract brewer hires someone else to make their beer while a gypsy brewer uses the surplus time on the brewing equipment of another to make a separate line of beer. In each case, the owner of the brewing equipment does not own the beer... unless that is part of the behind the scenes deal to get access to the equipment. The contract may or may not include marketing, shipping and the rest. Depends on the terms of the contract, doesn't it. Pretty Things, for eastern North American example, does not own its own brewery but makes the decisions so it is an example of the gypsy. These BAers have been forming a shortish list of likely actual suspects. You can provide your thoughts and accusations on that as you feel appropriate in the comments.
But there is something else to note. The fudging of the idea is alleged in the article to be based on the brilliant linguists of the Brewers Association whose recent work has been noted. The two ideas are muddled here, too. I am not sure that is correct, however, from this BA webpage which clearly described contract brewing for what it is - despite some of the other head scratcher definitions in there. Why would one widen the definition of "gypsy brewer" to include anyone who hires someone else to make beer? Because "gypsy brewer" sounds neato and swell while the more accurate "contract brewer" is laden with... accuracy? The trend towards adulteration of the language in the name of good beer is a bit weird, isn't it.
This is not a crack at all against the project which I suspect includes far more hands on involvement than a contract brewer would sully themselves with. But there is something unseemly even needy in all the slipperiness, isn't there. Again, thoughts and accusations on that as you feel appropriate.