alt Hacker NewsDid you even bother to read the list?
These aren't simple pad left functions. Good luck making a Core-JS on your own. All of these are crucial to basically everything continuing to work - and more importantly massive security risks if their maintainers stop.
what do you mean by "making on your own"? The first example(time zone db) is portrayed as "holding up" 4B android/iPhone devices, and Google/Apple for sure have the capacity to create something "on their own".