to limit the existence of new exchanges at this moment is hard to realize. according to the current situation that it's free for everyone conducting cryptocurrency exchanging.
we don't say cryptocurrency are free to explore it without any limitation and regulations. if it limited the exchange that will generate other issues such as monopoly that can burdensome crypto traders/crypto investors, the arbitrary fee amount is one of the most fearest, and then it slowly close potential growth of cryptocurrency, the emergence of various exchange surely easier the access everyone to achieve and get cryptocurrency. indeed, there is a bad quality exchange that prejudice the investors. the regulation is assured but the limitation is hard to realize. that my thought