Sure, discord has millions of users but they’re of a particular demographic. One that requires moderation, is typically higher maintenance, and less likely to spend money (speaking from experience from a few years back). Discord demographics scew young and young audiences spend a whole lot less than other groups. Not saying that as a knock against them, it’s just the way of it.

But the potential to gain more is just that, potential. And comes with much more to manage. I don’t have to moderate my Patreon comments for example. I did have to actively keep out trolls and shitheads from my Discord server though. More power to any creator who wants to try and deal with that, but it’s an easy pass for me and most creators I personally know (which is primarily artists/musicians for context).