The Unity Asset Store is the same and is a thriving marketplace and has no DRM. In general this is a non. Anything that allows you to see source code or art assets in a non embedded form at first seems like a risk, until you realize that every protection scheme really doesn’t stop anybody and rarely even slows them down. Whether it’s Blu ray, .pak files, music, etc. anything that can be obfuscated through logic can be un-obfuscated through logic.
There is no to fix. While you can almost certainly point to a torrent or pirate site for just about anything, these don’t really mean that they were going to be customers until they got it for free. The reality is those were never going to be customers. From a legal perspective, sure you could spend a lot of energy for little results but it’s better off spending that energy into making a better product.
It should be telling that Epic themselves has their own source available and isn’t hiding that source behind DRM.