Going down without alerting customers on their mail is bad and that's what Gate.io failed to do, I do receive messages on my mail from different exchange I have used before about their impromptus maintenance, so its not something new in the crypto industry.
Mt.Gox, QuadrigaCX. Cryptopia etc. The stories are hacked but do you really know the real story. It's very easy to move coins and tell the world that someone else took it away
These exchange were quite good and trustable especially cryptopia, which my funds also lost there too, but at some point a shock news came up, that its gone, it doesn't really matter how big or small the exchange is, but the fact is that you can't be smart all the time and choose the best exchange even Binance had been hacked, but the main points here is "storing coin on exchange is not appropriate" except you are performing a day to day trade.
