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Separately, it seems like not a terrible plan. Better than eg hoping that Google and Oracle continue to care about the languages and runtimes they own. Go seems reasonably well used inside Google but Flutter is an open question, and the future of the jvm seems fraught with Oracle as its steward.
I assume GP refers to the license of MoonBit, SSPL + exceptions, which is not generally considered fully open source.
https://www.moonbitlang.com/blog/compiler-opensource#why-a-r...
Usually this type of license is used to keep more profit options open, but it will slow down adoption.