So for instance, if you (a creator) wanted to run a private discussion forum on the web somewhere just for your patrons, and you're willing to do some programming, you could implement a system whereby your discussion forum software checked in with Patreon.com when someone logged in, comparing their email address with the one on file for patrons, to see whether or not they should be let in in the first place, and if so which forum features they should have access to, based on their tier.
Well, you could.