I completely agree about illegitimate claims, it smells fishy from any angle.
the difference with the movie example, is the marketplace assets do not get “consumed” once purchased/opened/viewed. far from it. you only “consume” it once you start analyzing it for learning purposes (mostly relevant on BPs, code and materials), but most likely when you put it in an actual project.
asking the seller might prove useful in some cases but I usually avoid that. maybe it’s just me but I’d imagine that as a creator, spending 1 hour doing further technical explanations and preparing additional material is just making you as marketplace seller even less profitable. I know it sounds mean to potential customers, but time is in theory better spent creating more content to sell to more people.
actually I expect content creators to not always be responsive (it’s the case in some forum threads or marketplace comments). also many things won’t be clear until you see it (materials).
if you manage to do such customer care and still manage to be profitable, again kudos to you
for me a somewhat better solution to the inherent problem of no-try-before-buy + no-open-refunds would be an Html5 export of the project that can be viewed and tested in lit/unlit/wireframe. it would mostly just be useful for art and of course it would need some packaging and encryption of the assets and some other creative ways of limiting the use (to avoid hackers to just download and unpack the assets)