Blaine
Cis-Het Oppressor
It's inherent in that specific good sold by that specific vendor, yes. Another vendor may sell a similar good that is allowed to be traded after purchase.
I'm afraid it isn't. "Inherent" is synonymous with "intrinsic"; the tradable/non-tradable status of the good in this hypothetical isn't intrinsic, but is by definition extrinsic—that is, a quality that isn't inseparable from or essential to the good, but rather one that can be altered by the vendor.
You aren't the first person I've run across who's fuzzy on the concept of intrinsic vs. extrinsic. Nice try, though.
The notion that non-tradable status is an inherent quality because the vendor says so is especially funny when one considers that consumers can often find ways to trade or sell such digital goods anyway, whether the vendor wants them to or not.