This is Alek Felstiner, the author of the article to which you linked in your post.
I believe I understand your concern around lumping a bunch of processes together into an "industry" and then ascribing to it various characteristics. You are of course quite right that many companies use crowdsourcing to solve problems, and they do so in different industries, in different ways.
But I don't see the danger in referring to the crowdsourcing industry, as long as you're actually referring to the firms that provide crowdsourcing services & support. That is how I used the term in the piece you linked.
I don't think it strains the imagination to contemplate the possibility that a management process can be made into a product. There is certainly a "subcontracting industry," despite the fact that one could also accurately describe subcontracting as a management process.
Of course the companies that use crowdsourcing are not in the "crowdsourcing" industry. But there are a growing number of firms that deliver crowd labor, along with a variety of services that make crowd labor simple/palatable/safe. And those firms are making money by providing this service. They are in the crowdsourcing industry, regardless of what their clients happen to produce/provide.
Now, that doesn't make it any more accurate or appropriate to make sweeping generalizations, as you pointed out. And, of course, crowdsourcing can exist outside this industry, as a management process or a theoretical concept. But an industry does exist.