How does this differentiate from YouTubers selling their gear on existing online stores like bigcartel, cafepress, zazzle, etc? Not sure there's much you could

How does this differentiate from YouTubers selling their gear on existing online stores like bigcartel, cafepress, zazzle, etc? Not sure there's much you could offer on the basic premise of selling shirts with a logo on them. Many youtubers also already have existing partnerships with brands that they hawk in the descriptions and by actually wearing them in the videos.