Maybe this approach would have made sense if the area were an established hub in whatever craft those immigrants are specializing in, but in case of Portugal what I can see is a country with (formerly?) cheap CoL trying to attract immigrants who keep working remotely, paying taxes elsewhere and contributing whatever little consumption tax they pay into the local economy. There's no established competitive IT industry or academia. This isn't how you build high-tech economy, it's how you become a suburban wasteland for rich people.