I don't think the argument is focused on what Meetup should do, but what they could do if new user acquisition were a priority. It's a growth tactic that can be balanced with retention and engagement approaches, that Meetup right now understands and is heavily investing in.

Taking this approach also doesn't mean you'd have to go full throttle. You could test and decrease the pace by only allowing a segment of quality organizers the ability to create their own app.