Python is generally not used for the types of hard problems where a company specific library would help. When performance or code size matters you leave python for something else. Thus C++ will get libraries anytime the standard library had to make a tradeoff that isn't always right. Python by making the tradeoff for features has limited itself out of places where you would trade less features for something else. This is great for python as it wouldn't play well in the less features space anyway.

I expect to see company specific libraries for rust at some point because rust can play in the same space as c++ where you might want to make a different trade off.

I think this is a one sided view of Python, even though its true that it's most often used for easy problems. Eg Dropbox and Youtube are using Python, solve hard probs, probably have proprietary libs, and care about code speed.