Two things:
1. You can register ONE account through your own link.
what it means? referral link is valid for on time registration only and expire after each registration?
the referred user must deposit and play in order to get bonus for referring him or its just for registration
No - if you don't have a BetCoin.tm account already, you can use the referral link I send you to make one.
The number of referrals through that link are limitless. But you can only make one account through it yourself. All others must be real referrals.
Does that make sense?