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But think about it, if you were around 10 years of age and you are extremely talented in football, you have your idols and you are dreaming of certain leagues where you would love to one day play, would Ligue 1 be part of your dreams? This is the biggest problem I think for clubs from France. PSG is an exception because they can make up for a bad experience with money. Playing in Spain or England is very different from playing in France. El Clasico in Spain, the derbies in England and so many other things that are great in those leagues. The only thing that could convince you to go to France is money. No young talent would ever go to France if clubs from Spain and England are also interested.
It's said that even an absolute success in Ligue 1 won't put your name written in the history of football. Ligue 1 doesn't have the same quality and global recognition as La Liga or the Premier League. France has a rich footballing history as a country, but players who played in Ligue 1 are rarely mentioned as legends in football world. The quality and perception of a league often influences how players and their achievements are remembered in the football world.
If Mbappe has big ambition in his footballing career, it would be rational decision to move to La Liga or Premier League. The only reason for Mbappe to stay at PSG is that he accepts an offered big money by PSG. That only means he just doesnt have big ambition and chooses to stay in his comfort zone by always being the best in his own backyard.