They get payed, obviously.
Users can pay the developers! When you love your tools and you own the tools it's just common sense that you feel enticed to contribute for their improvement.
Some of the developers actually get paid. Others do it on the side. Somehow, it works.
They will be heros & called everywhere & be payed awesome fees to make it work!
Most of them are paid by companies, others work in their free time.
Click here to make a donation.