Meetup is arbitrary with the enforcement of their own rules.
I built two different Meetups and in both cases they shut them down and they were both legitimate topics that have plenty of other people doing the same thing (I wasn't setting any precedents).
And the worst part - they just shut you off without giving you any tips or suggestions on how to become compliant in their system if they determine you're not. Just "POOF", you're deleted. What a crock of@#$%.