Happy to help! I’ve just forwarded your new questions to our legal counsel and I’ll respond here when I hear back from him. We’re a bit slammed catching up from GDC so I don’t know exactly when I’ll get a response, but I wanted you to know that we are listening and that I’m working on getting answers.
I can’t comment authoritatively from a legal standpoint, but having been a content creator for many years, the way I read the language there is that it’s mostly intended to keep someone from buying something from the UE Marketplace then immediately reselling it on the UT Marketplace or other marketplaces online. You’d be surprised what people try to get away with, even innocently. 