[mst]

They seem to be fairly explicit that _they_ believe that extensions aren't covered by those restrictions.

Possibly the license text needs to be tweaked to make that more clear (IANAL too) but I read it as meaning that commercial extensions were fine, just not commercialising a patched version of the core code.

Your concerns do seem entirely reasonable, but if, in practice, they become an issue, it seems like the codified-in-law goals of the foundation (see https://defold.com/foundation/) strongly suggest they _would_ tweak the license text as required.

I dunno, I don't think the harsh restrictions you mention exist, and I'd hope that if any actual lawyers read them as existing then their employers will direct them to help get the license bugfixed.

So colour me "cautiously optimistic" here.