I can't talk for Spain in particular but keep in mind that employer's social contributions can be pretty hefty in Europe. And working remote for an american com

I can't talk for Spain in particular but keep in mind that employer's social contributions can be pretty hefty in Europe. And working remote for an american company is opening a bag of hurt regarding taxes and banking. For instance that guy making $128k in Montpellier in France, that's €108k right now. Assuming he works 45 weeks that's a daily rate of 480€. Not crazy for an experienced developer.