In no particular order
>Discord
>All oldfags from the Skype days dead
>Discord
>You can no longer host on /b/, /r9k/, /int/, /pol/, etc
>Discord
>Hosting on /qst/ is a lost cause
>Discord
>No community of value is left to make threads
>Discord
Biggest reason is discord irreversibly fucked risk and raped it's cold, dead corpse.