This makes small businesses lives in Spain hard, and make big corporates think twice before getting real big centers in Spain.

This lack of competition is the reason you need to consider moving to US to have a good chance of a better life.

I think this is generally true if you are looking for a place that can best leverage your skill sets for maximum financial rewards, and you are willing sacrifice some quality of life in doing so.

"If you aren't (and enjoy government financial support) the US is not the best place."

I suppose this is the part that got you downvoted because it came across snarky. But it's also not entirely true. You can still be very average or somewhat talented in the U.S. and still hold much better paying jobs in the U.S. than you would anywhere else in the world, if you pick the right sector.