The small company focussed on their core service. The VC corp has to reach out to new markets, increase sign ups, please advertisers and produce shiny growth figured for investors.

For users of the Meetup site it should be slim and I want to spend as little time there as possible (i.e. get invitation mail, ideally respond by mail, done) Meetup however wants me to "engage" trying to convince me to go to more meetups, rate them, comment, ... do as many clicks as possible while not driving users away ... all these deceptions take time to do, to try out, to A/B test. A committed founder who uses the site themselves notices where users got trouble and works on that. Maybe not in a team of five but also not hundreds.