Well they where the only spaces available because he made them.

Like, once the old forums died there was no other hub for the fandom, and Hussie and WhatPumpkin where in no rush to create a replacement.

It took almost 10 years for a semi-official alternative, this forums, to show up.

So like, I cannot fault Makin for creating actual spaces for Homestuck fans, when the apparent alternative was having nothing at all.