I think that what Wolfram is missing is that devs are not interested in getting hooked and then paying subscription fees. The payment model is the problem and devs won't be easily suckered by a free version.
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.