> Even in my small Eastern European home town I hear more and more french speakers in the city center every year, and when I talk to them I understand they're all here to study medicine or get junior tech jobs, which is insane to me and speaks volumes on how bad the French jobs market must be for the youth when Eastern Europe is now an immigration hotspot for the french when 20 years ago it was the opposite.

It's often mere fiscal arbitrage. Look at the Belgians in Sofia for example. Euro zone, simpler and more stable administration, much cheaper, better climate, good food. Ridiculously lower taxes. Work remotely for Belgian customers. Pay 10% tax instead of 53.5% + 25+% employer social security contributions + 13.07% employee side. Even in a junior position, working for a Belgian client, you are so much cheaper to them while your net income is so much higher.