We cannot really blame the exchanges for being limited to some countries. One of the reason why exchanges have limited or no access to other countries is because of the government itself. The policies of the government and their regulations are sometimes very hard on exchanges and sometimes they will ban it in their area. Such as binance cannot be accessed in the US because of the economic war between US and China. Also exchanges are also business and their biases is not just for themselves but also to protect their investors and users.