I think your worries about what is kosher and what isn't under this license are warranted and I'll try to point this to people internally so that the licensing terms can be clarified.
If Wolfram adopted the Unity model I’d be much more willing to try it out. (free to cheap for hobbyists and small businesses, steep rise in price based on revenue per year)
That makes it a no-brainer to use--you pay little or no licensing fees until your game takes off. Unity makes their money off the unpredictable winners, while gifting a nearly free product to the hobbyist and startup ecosystem.
Wolfram Engine is more like the Epic Games (Unreal Engine) model: free to download and play around with, but steep licensing costs before you ship anything. No way to quickly iterate and try things, only paying up when an experiment works out.
Actually, the cases you described, making an investor demo or the like can be argued to be prohibited by the license! Does an investor demo or MVP count as commercial use? I’d say so. Would an MVP potentially produce data that I might use in the production of a “real” system? Likely so. Both of these are expressly prohibited by the license, straight up in the first section.
“Yeah but you’ll get away with it fine.” Will I? I also must respond to Wolfram with a record of my use within 10 days of being asked.
How is this an attractive state of affairs to build anything, even for paltry testing of an idea?