It's a mod, not a dlc.
Modders work on mod for fun, prove something, make their own vision of the game, because they like modding, because they want to improve the game, because they want to give something good to public, etc (select one or more option
)
But modders definitly don't work for cash.
Giving cash doesn't change something and didn't speed up the patch. Even if you give a good amount of money, modders can only work during their free time and when they have this time.