Mate, FDJ chose Barça over other suitors. Barça are a legendary club in the world's top six alongside Real, Bayern, Juvé, Milan, ManUre & Liverpool. By contrast City are relative newcomers to the upper echelons of world football.
He made a choice that most players would've made at the time. Admittedly with the state of Spanish football & Barça's finances, I dare say if he was younger & had the same options available, recent treble winners would be up there with Barça.
Barça are a historic club, & City are trying to reach a similar status. In terms of trying to get there, I'd suggest we'd have to win a couple more Champions League titles to reach Barça's lofty status as evidenced by Khaldoon & Pep saying recently this is our longterm aim.
Take Bellingham for instance... Two days ago he stated he chose Real because in his opinion they're the biggest name in world football. Are you seriously claiming that the players at Real, Barça, Bayern, Juvé & Milan lack the ambition to test themselves at the highest level because they opted to play in Spain, Germany & Italy over England?