We take privacy very seriously and include in our privacy policy that we do not share, sell, or trade any of your information. Additionally, we encrypt all data on our servers and all communications to and from your systems and our servers are encrypted. Everything is password protected and we take great pains to keep our systems up to date and secure.
As for your team, there is no method for anyone to see how many or who is in your team. However, as the system is now, you and your team's names will come up in certain search results like when searching for a name to split business with or searching for a trainer to assign to a "Request Trainer", etc.