My guess, based off of absolutely nothing, is that they expected stronger growth out of the gate, given the rate at which r/Pathfinder2e had been growing, and hoped to see that community choose the Fediverse. But the mods there crated their own forum that drew very little traffic in its own right, a bunch of people shifted to the discord, and then everyone quickly filtered back to the subreddit when it became clear that there mods had no will to actually do anything beyond the symbolic.