Because many never used Smalltalk, Common Lisp, Self, Dylan,... so they think CPython is the only way there is, plus they already have their computer resources wasted by tons of Electron apps anyway, that they hardly question CPython's performance, or lack thereof.
I use Python 90% of my day and I can't say I like it or hate it or care about it at all. I use it because it has all the libraries I need, and LLMs seem to know it pretty well too. It's a great language for people that don't actually care about programming languages and just want to get stuff done.
