I learned the other day that the developer(s ?) of uBlock origin don't even accept donation. That's a really dedicated behavior for someone owning on app installed on probably a million devices, that could make money in an instant if he wanted to.
This suggests to me that he doesn't need nor care about having more money, and will be very hard to corrupt by offering money. How do you bribe a person that has free money with no strings attached offered to them and says "no thanks"?
Threaten physical harm
proof: https://github.com/gorhill/uBlock/tree/0797d040740de8e9f7552...