It’s 11:43pm on a Monday night. My 6-week-old son is asleep in my office so my wife can get some uninterrupted rest for the first half of the night. He’s finally asleep now, and I probably should be also after a full day of work. But I’m not done for the day. Even though I’m a software engineer by trade, I’m also a computer programmer by hobby and passion. So I do what I’ve been doing for well over a decade now: I boot up my computer to write some code.
Sounds like you don’t know the story of core-js. Any popular open-source is basically unsustainable without profit.
https://github.com/zloirock/core-js/blob/master/docs/2023-02-14-so-whats-next.md