Projects by no-name companies too insecure to open-source their stack but also too shameless not to flog it every chance they get are not worth even considering. Programming languages that aren't fully and permissively open aren't worth a bucket of spit. And I don't provide my business to the latter, either.

Especially when superior options exist, because "C# on the JVM" also isn't even particularly valuable when you're a competent programmer who is capable of learning new things.