db0 and Unruffled have both been banned for reactionary behavior and, in the case of the former, DM harassment.
Due to these irreconcilable differences we thought it only right to allow the community to weigh in on defederating immediately.
According to this person “tankie” is anyone that criticizes the privilege of white westerners in the imperial core who have been privileged and comfortable their entire lives off of the backs of colonized people.
Further context can be found in this thread
https://hexbear.net/post/2484423
As always, use 
to vote for federation and 
to vote for defederation.
I don’t have skin in the game either way, but I think generally defederation is for instances that are inherently reactionary while banning can be done on a person by person basis.
I’m a .ml account though so those are my unasked-for 2 cents.