Yeah, you can't register successfully if your country is banned from a
tracker, and your action may push your inviter to being banned. If your
IP is whitelisted or you're approved to be able to
signup from a banned country, your
signup will be OK. Some
trackers block banned countries from
signups or using the site, some just block
signup from banned countries only.
Most of
trackers that I know ban all
signups that use VPN and the inviter may experience the risk of losing his account.
P/S:
I have never had a chance to taste HDBits
signup from a banned country, and I really want to know if someone did such a
signup