It's weird that the author is surprised that the system kicked them off for signing up for a new Discord account and immediately sending the same message to three people via DM.
That's the base vanilla behavior template for a pornbot.
Yeah, which indicates what a terrible false-positive this is. It's like their spam detection is just pattern/behavior based, and entirely unintelligent, censoring even authorized users doing normal things in projects they participate in.
I wouldn't call it a terrible false-positive. The Bayesian estimate on this behavior is that it's far more likely to come from a porn-bot than a legitimate use case.
(Arguably, the use-case in question isn't even what the service would consider "legitimate;" user was trying to tickle the tiger's tail on purpose. If one doesn't want to get kicked off like a porn-bot, it's not hard to avoid acting like a porn-bot).
That's the base vanilla behavior template for a pornbot.