I don't think those two are good examples. They both had significant commercial ecosystem support, either in the form of a large company that pushed it (Google

I don't think those two are good examples. They both had significant commercial ecosystem support, either in the form of a large company that pushed it (Google with Python) or in the form of other commercial compilers that promoted the ecosystem (lots of commercial C compilers over the years - MS, Borland, Watcom, Metrowerks,....).