Our recent benefit t-shirt for front line medical workers went from idea to market in record time because of our close relationship with Out of Print (the company that makes my t-shirts, masks, pins, & bags). We raised $ 35 k with that initiative alone.
On a personal note, I have spent many years ensuring that my characters are on the side of kids and their design is pleasing. Many knock-offs are clearly on the side of adults who wants to modify children's behavior; a breaking of trust between my characters and my audience. Also, what is up with those typefaces?
Consistent licensees include Out of Print, YottoY, and Demco.
Wernick & Pratt has offered guidelines for use of my characters and ways to spot infringement. Please take a look.