I guess it depends on what you consider "crypto capital". Most businesses registered, most trading volumes, etc. At the end of the day, even if such a country or city exists, it won't be able to serve everyone, especially those who live in another country. Just like how people view Las Vegas as a gambling city but people still gamble on another country/city. It's just a marketing term, it won't affect the network IMO. Sure, there will be some concentration of mining power and so on if the benefits are huge, but not every miner will go there for various reasons, including privacy, decentralization, etc.