No one developer gets paid €134k/month in Europe. Average salary is probably more like €65k/year across the EU.
It does appear that the majority of top contributors are from European countries but overall pretty diverse: China, Australia, New Zealand, Russia, Brazil, Egypt are represented as well.
That said, if I revised my comment to say two developer salaries per month, or 3, 4, etc. it is still impressive in my view.