You are not making "your tree". You are contributing to THE WIKITREE tree.If one of your "people" matches a profile already here, you acknowledge the match. You do NOT make a duplicate that's "yours". You will get into serious trouble if you can duplicates. You don't have to be in the Trusted list or be a manager of an open profile to add information go it.
If a profile already here is ackowledged by you as a match, it will be part of the tree chart of your lines. If you download to go elsewhere, the whole will download.
As to what kind if trouble you can get into if you creats duplicates, you could, if you break the rules be placed under mentorship where what you do is monitored and watched, and if you break a lot of rules, be locked out .
One profile for each person is the rule.
Good luck and enjoy wikitree