>>96553620
Because the board is dying, and if you block out all fresh blood, it will die even faster. People churn out of any board - die, move on, get busy with work, etc - and if you don't replace them, you just have a bunch of old grognards slowly decreasing in numbers while producing not a single damn thing of note.
Seriously, when was the last time a /tg/ project had ANY influence on the wider ttrpg community?