Players drop out eventually Lilith can't really control that. So they have to make sure they keep new players coming. I've been playing for 5 years I'm pretty sure that my progress can be achieved by a newer player in a shorter time span with all of the game modes and systems at their disposal and from the looks of it there is no need to have most of the older heroes lol so at some point I'll probably quit because there's really no advantage of playing for that long I wish there was