The number of businesses in a city accepting cryptocurrency isn't what makes it the top 10
The number of users is, by far, more important and show the real picture of the city. If a city has 100 businesses accepting cryptocurrency but nobody is using it then it's worthless. You can have 100 businesses accepting crypto but if only 0.001% of the transactions are paid in crypto then it shows nothing (especially considering most of them are small or very small merchands)
I can say categorically that the number of businesses accepting bitcoin as a means of transaction is directly related to the number of users. If you have users and there are no merchants, then how do you encourage users to keep on using bitcoin? For there to be that much merchants shows that the users are available, remember that the businesses are owned by people who wants to make money, they must have seen the potentials before taking their decisions.