I also ask what rules should be in place, because bitcoin is in my opinion a system that anyone can access
Yes I agree with you. Bitcoin is accessible by anyone that's I think bitcoins should have rules and regulations to maintain the bitcoin orderly. The should also think that the rules and regulations is not to control but it is fot improvement.
Yeah absolutely of we will think in advance for improvement there's a possibility that bitcoin will be used for some criminal activities like hacking and money laundering. But because it is a crypto currency and digital in nature there's always chance for improvement.