I dont think it's serious enough for the good pro players, nowadays fpl is just packed with unknown/shitplayers both in Europe and in NA. It's not a good place to practice, it's just a place where you can play a scrim without having to play mm with toxic kids from hltv.
Coldzera said one time that fpl/esea disturbed their mindset and mentality of the game. Like It was another game playing fpl and playing tournaments, so he didnt like to play that much.
Maybe its the same issue with the Astralis players stopping to play fpl.