Here is some information regarding the reason Bitex has chosen Dubai as a launch site is because its currently one of the global blockchain capitals of the world.
Dubai has a strong story to tell, take a look at the opening speech at the World Blockchain Forum:
https://youtu.be/oa3Ih0DEmZMWhen crypto is adopted on government level it boosts it and gives it a right to be used for various government and non-government services, from their daily coffee and childrens school fee to utility charges and money transfers, it is legitimate and adopted flexibility and convenience.