Galaxy /AEG cares more about their brand & image now vs the very little bit they get from youth soccer affliations.
Sure they grow fans that way but the movement by the MLS clubs to get out of or not even be in the youth club soccer business in the first place beyond DA is becoming the norm. You will notice LAFC, Atlanta United, Miami, etc might have partner clubs but not affiliates. They give these partners support, coaching occasionally, events in exchange for selling group tickets to the games, some interaction with the players, ball kids, some badging on the website but the youth don't wear the MLS jeserys and use more community based names such as Concorde Fire, Georgia United, etc.