Dealing with rejected spammer registrations

[XFFA.IR Bot]

Recently, there's been an influx of spammers trying to register, all getting smoothly rejected by the standard spam controls built into XenForo. While this is nicely keeping my forum free of spammers and staff from having to manually look over those registrations and reject them, they've now built up to around 300 users. Judging by the style and similarity of usernames and email addresses, I'd say it's likely a bot or bots doing this.

I'd like to know, is there any downside to just bulk...

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