Canada, US, UK, Switzerland, Luxembourg, Japan, etc... Salaries don't have to be 2-3x as high (past a certain level it doesn't matter all that much), salary isn't the main reason why french people emigrate.
There must be something else or something wrong, because you indexed one of my small repo (~100 stars, ~20 forks, ~20Mb) and not the bigger ones (~500 stars, ~100/150 forks, ~150Mb)