Back in the day we started with Qbasic not because it is a good language but because that was easy to set up, we all had it and our friends had it and our school computers had it.
And JS is less bad a language than Qbasic.
Set up is rarely an issue, once you set up a language even as complex as C++ its completely automated. You press a button and magic happens.
If the biggest selling point of a programming language is that it comes preinstalled with the OS of your choice, its not much of a selling point when the average user downloads and installs GBs of data just to play the latest game hype like Fortnite.
The only people who mind installing stuff are predominately web devs. 99.9% of users out there are fine with it for more than 6 decades now and that wont be changing any time soon.
But you can hack away on any computer with a browser.
Ideone is a popular example https://ideone.com/