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Don't lose guard in any exchanges because there is really a chance that the exchanges in some trading platform disappeared in which it always happen so much in different exchangers in which it will suddenly go down the server and you will not be able to withdraw your money or earnings. It would be good if you will be able to just careful everytime because we don't know what would be happen on the few more days. It is more better if we will be careful and secured every time we are trading in some trading platforms.
The thing that is even worse is that some exchange would freeze your funds instead that you can't even pull the minimum of it. Finding a lot of exchange would build a flexible trader especially if leverage trading is being done, but consider the fact that some exchange around the corners of the internet are just waiting for people to be preyed. Sometimes I ask myself, why do people still tread to far if we already got reputated exchange like Binance, Bittrex, etc.
There would be coins that are exclusive to an exchange, because it is an exchange coin but people should be aware that if it is an exclusive shitcoin in an exchange then probably it is a shit-exchange also.