Can you clarify the accessibility of Bitkub for foreigners? I'm interested in understanding if non-residents of the country where Bitkub operates are able to use their services. Are there any specific requirements or restrictions that foreigners need to be aware of when it comes to utilizing Bitkub's platform for cryptocurrency transactions? Additionally, what are the steps that a foreigner would need to follow to successfully set up an account and start trading on Bitkub?