1. Hate to tell you this, but people who constantly perform "Chargebacks" on credit cards suddenly find out they can't get credit cards. The CC companies look for people who do this, and blacklist those who try to keep doing it. They generally won't be able to get CCs from another company either. However I agree stolen credit cards are going to be a potential problem.
2. What? How?
This is not true, and would be illegal for a credit card company to do this. Initiating a chargeback is a right that you have if you did not actually authorize a purchase or if the item you purchased was not what was advertised (among other reasons). It is illegal for a bank to deny a loan to someone because they have exercised their rights in the past. 2. What? How?
2 - I think he was referring to people who hold their bitcoin in circle when they finally run out of money
