Ask HN: Messaging and content moderation in a social app

I'm working through a paper idea for a social scheduling app. The question I have is as a solo developer, should I include messaging if I'm unable to moderate the content due to time restraints, and unable to afford content moderation via third party service.

I'm thinking of including canned phrases to fulfill things like "I'm running late" or "Let's reschedule" as a substitute, is that going to be enough?