Yeah the back 3 are not fullbacks though, their wingbacks spend a lot of time in the final third. Monaco play with 2 attacking fullbacks, Real Madrid play with the most attaking fullbacks in Europe, Juventus play with 2 attacking wingbacks......
Name a top team right now that plays with a defensive fullback who offers nothing past the halfway line?
It's easier to play with attacking fullbacks in a back 3. They have 3 centre backs in addition to wanyama and Kante/matic who are defensive too. Effectively 4 defenders to ensure full backs both sides can attack.
In other leagues they can play that way because of the superiority of their teams. In Europe, juve aside most of those teams were found out defensively in games.