The print on demand industry Return of the rave green 2019 champions shirt . is gaining an ever wider appeal, thanks to the latest player in the industry, Merch by Amazon. You would think that with companies like Threadless, Zazzle and Spreadshirt, the market would be over-saturated. Apparently, that is not true. More and more people are joining in and waiting long months to be accepted as sellers on the site.It was common for skilled designers to join such platform; either for additional income or to appeal to larger public, since these businesses tap into a wide variety of tastes. But now, you don’t necessarily need to follow a thorough Photoshop course or graduate from design school to open your online shop.