Average 1 year account retention rate / Account Size
This chart implies correlation between account size and long term churn rate.
Thus, it can be inferred from the chart above that larger team sizes directly correlates too long term churn rate.
Average new accounts lost after the first 30 days / Account size
The chart above shows that new account most likely to leave are solos, medium teams, tiny teams, small teams, and large teams respectively.
From these data sets PhoneBurners best accounts are large teams, small teams, medium teams, tiny teams, and solos respectively.