"Hi X,
Y stepped down from organizing meetup Z.

You are one of the top members of this Meetup, so I think you have what it takes to be a great organizer. Stepping up would help ensure that this community continues to survive past [date in the near future]."

Third time I get a message like this from meetup. Usually followed up by threatening to delete all group data forever if no one "steps up" (e.g. pays their bills). F***ing vendor lock-in! They have been colleting and publishing data for years only to blackmail people to continue using their services.

Some meetups (at least in my region) have switched to LinkedIn, so we will surely receive messages like above from LinkedIn in a couple of years.