It’s important to separate the operators officially licensed in Nigeria from those that don’t have such a permit. The international betting sites that have the Nigerian licence have the same registration, depositing, and betting processes as the local bookmakers. They also accept Nairas. Our government doesn’t take any action to prevent citizens from betting via international websites that don’t have a Nigerian licence. However, in this case you spend more which will be subject to a currency conversion as you take all the risks yourself.