Cloud providers do if you run your program on their platforms. That’s not exactly what you want but that covers a significant part of the market.

Lots of languages like Python, NodeJS, C++, even Perl have commercial support offerings.

OK but not from the creators of the languages themselves, I think?

The point remains though that it's the same situation. There's a free open source implementation and some companies that offer paid support.

Dotnet has commercial support from Microsoft. They are C# inventors.

(Also to needlessly quibble, technically James Gosling under Sun Micro-systems invented Java)

Pretty sure you can get support from Microsoft or other vendors for their C++ compilers.

Microsoft aren't the creators of C++.