"Onboarding" is critical, and every single step not only Can lose customers but Will lose a certain percentage. Too many steps and your failure rate is compounded. Even losing 10% at each step means losing half after 6 steps.

In an app that requires at least 2 people to work (I work on one of those for a living), I'd guess that the 1st person tries it, finds nobody else online to interact with, and gives up instantly. We solve that by putting an Invite feature prominently in our onboard process. New users connect with someone almost immediately.