Restrict the number of accounts that can join that family group. And/or remove the ability to share the library from the main account for repeated offenses.
Or require multiple family members accounts to have to cheat before the owner account is banned.
I’ve made a few things. One, Mickey shaped cabinet hardware I put up for free because I didn’t want to deal with Disney. Though I might put the raw print up on Etsy or something just because.
Another is a frame to turn a Disney name tag into an ornament. I’m selling the completed product rather than releasing the design because I wanted to really offer it to people who didn’t have 3d printers and wanted to ensure that it met my standards. And I didn’t want competition. That said, it takes quite a lot of time to print, prep, sand, and paint. I spend a couple hours in finishing each and sell it at a price that… Totally doesn’t make it worth it.