$10k a month is a 'sustainable full-time job' for a senior developer once you factor in health insurance and the additional 7.65% self-employment tax.

I prefer this model for opensource software. We get an awesome product and he gets enough money to sustain himself while maintaining it. Seems like a fair deal for all.

That's quite a bit less than someone with his skillset could earn in the US. He could easily earn 2-3x that amount in Silicon Valley, and possibly quite a bit more.

Ok I didn't know that. I heard IT wages in the US were good but I didn't think they were that good. Here in Spain you're doing well with $2200 and that's a senior position at a big multinational.

This is more or less what a senior Frontend dev usually makes in the US. The author single handedly made the first serious FOSS VPN that can replace IPSec and OpenVPN