Its worth zero.
Arguably if they removed this dependency platform, code quality would rise because developers would have to take responsibility for each 3rd party lib they consume.
As for donations, the developers library website should have a paypal link on it and be done with it. This is pretty common for C libraries that are heavily used.
Why do Javascript developers feel they deserve an "app-store" to pamper them and cater for their every need?
Biting the hand that feeds IT
