I simply stopped browsing and buying assets on the marketplace.
I now only buy assets from trusted creators and avoid Fab entirely. I don’t know why Epic wants this or won’t take the minimum effort to allow us to at least sort this stuff out. It’s been a few years since this problem emerged, and now there are both distribution platform and court-tested reasons why creators might not want to buy assets that use fully generated content. I’m sure Epic is fully aware of that too.
I used to spend thousands of dollars on Epic’s market. Now I barely spend anything.