www.binance.com ,okex,huobi,coinegg
These trading platforms can be launched online, and these trading platforms are easy to launch.
You are greatly mistaken if you think it is easy to be listed on exchange platforms today. The market dynamics are shifting at an extremely rapid pace. I guarantee you from personal experience, that listing on any of the exchange sites that you referenced, are not as easy as you think.
Demand for cryptocurrency trading is so great right now that coin exchanges are forced to upgrade their infrastructure just to cater to new subscribers, not to mention new coins wanting to get listed. That's why many coin exchanges are geting away with 10 to 25 BTC coin listing fees. Imagine a $100k to $250k fee just to get listed? And many developers are gladly paying it. Wow!