I wondered about that too but since I’m trying to start a letterpress business that would produce and sell notecards and such, I would think it would be a copyright infringement if I used their plates to use on things I’m selling unless they have an angel policy I suppose.
Hi! I did when they first came out on my (then) Golding Pearl. Although they work ok I wouldn’t use them for long runs since the plastic can (and did) crack. Also I’ve seen several Etsy shops sell the items they make from the “L Letterpress” and calling it actual letterpress printed items. I don’t know if they have an Angel policy to be honest. After the cracking incident I didn’t really bother to pursue it. I’ve recently seen the wedding version of these plates on clearance at our local Hobby Lobby. Hope this helps out a little!=)