> The Wallaroo license seems to be non-free, which I think is very unfortunate and a misses an opportunity to be more widely used: (...)

Maybe. But then, if they require you to buy a license when you're using it to make money yourself (and don't try tell me that you can afford to run your hobby project on more than 24 CPUs but can't throw some money on the devs of your tools) then it is no longer "unfortunate" - it's just business. And don't forget that programmers need to eat too. "Widely used" does not directly translate to "making tons of money".

Bonus points to them for doing it from the beginning, instead of changing the licensing mode mid-flight.