Where is OKEx available?

I'm curious about OKEx, could you please tell me where it's available? I've heard quite a bit about it, but I'm not entirely sure where I can access its services. Is it available globally, or are there specific regions or countries where it operates? I'd like to understand its reach and accessibility better. Additionally, are there any restrictions or requirements that I need to be aware of before using OKEx? Your insights would be greatly appreciated.