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I’m suspicious too, because almost all the established members has a patreon ID in their profile. That looks like @patreon_123123123 (obviously, the numbers vary). But the profiles of all these newcomers show @ followed by some random word that isn’t patreon and isn’t followed by a number.
The visual interface makes it clear that people should register via patreon. Clearly, that has worked for almost everybody else. There isn’t a visible link that would be easily found by most “real people” to allow them to register by any means. And it’s too much of a coincidence for what looks like about 20 people to have come to the site in such a short space of time and to have all found a way to register without going via patreon.
So it’s looking like a robot has found (or guessed) a link to a registration page that isn’t patreon but is nevertheless working to create a login ID.