I would be mainly interested in top level trackers.

What are the aspects of banning?

Which tracker does it use this system?

For example:

The inviting person and the invitee do not live in the same country.
There is quite a lot of movement between countries in the EU, so it can easily be my real friend abroad.

e.g. my inviting man is romanian i am german person. Can it be a consequence?

What do they ask on the ban tracker IRC if I try to reset it at all?

They can only ask which country I know from, as you can only see the invitation IP?