Yes, this is a possible crack to the system and it should surely be considered by theymos. A person can created many number of alts to put himself on a default trust list.
Unless you have a sea of merit and enough DT1 members to overtake everything, you can't do that. We'd kick you back out. If you somehow managed to take over the majority, theymos would blacklist you. ¯\_(ツ)_/¯