Reason is very simple here.
Current system can be very easily gamed and you can be very easily in DT2 list (if not in DT1) by just included by one DT1 if no one is excluding you.
So three exclusion , simply means you need 3 inclusion by other DT (a democratic voting.)

Prove yourself a DT material , might be more people will add you or the user above will change the decision.

I do not see any reason for you to open a thread here why somebody included/excluded me/or I am in nobody list. Everybody have their personal preference to include or exclude.

PS: Just curios to know what was your prior contribution to this system before this new system is announced.