Vam 2 may end up on Steam one day, when it's finished, but 2.0 will absolutely not be.
Meshed has a business model that gives regular, consistent income each month, which is what's required for a program that will need to be under development for years.
If 2.0 went on steam, there would be a burst of early sales, a bunch of complaints that it barely has any features. A year or two from now, the money would run out, with little money coming in from new sales, and Meshed would have to close up shop and go get a real job.
Nobody wants that.
The current system works very well to fund ongoing development. Meshed would be crazy to change that.