"Broihier hopes that those looking to boost those paychecks will come his way to sell their work, and that purchasers will be willing to spring for more high-quality images."
Buyers are willing to spend money on high quality images, but Pixels is a self-curated site, which means there is no oversight, no vision to the collection, so there is not necessarily a "high-quality" ethos.
This isn't to say something "different" couldn't be created, say a collection of a all paintings to license, or all mixed-media, or something vetted for quality and then divided into collections like that. Then a buyer might say, "Oh, I need a painting I can license as to print to put on the wall of this TV show apartment" and then there might be a go-to resource for that. But that isn't really how this is being set up. It's just another big "here's a bunch of stuff" collection.