Huh, i don't know which place of Europe you're thinking about but this seems highly unlikely. You can't exceed 48h/week in the EU, and 100$/month (84€) is just stupidly low for countries in western Europe, it would even be illegal in a lot of them:
For example, in France, an internship longer than two months has to be paid 3,9€/hour a minima (for reference, minimum wage in france is 10,25€/hour).