Shell Gamehttps://en.wikipedia.org/wiki/Shell_gameThe shell game (also known as thimblerig, three shells and a pea, the old army game) is portrayed as a gambling game, but in reality, when a wager for money is made, it is almost always a confidence trick used to perpetrate fraud. In confidence trick slang, this swindle is referred to as a short-con because it is quick and easy to pull off.
https://pbs.twimg.com/media/C-e16GsXkAAmAcR.jpghttps://pbs.twimg.com/media/C-NS6HSWAAAJHZU.jpgThere's a lot of people currently living in mansions earning millions for doing nothing. They're all insolvent. It's not going to end well.
It doesn't take a prophet to see that it's only a matter of time before all these exchanges collapse.

Now is your last chance to withdraw your coins and savings.

Don't say I didn't warn you.

The lord has spoken.

Not all of exchanges as there are a lot of reputable which has been around for years, what you've mentioned was the new one maybe.
I trust local exchanges in my country, people behind who founded and support this exchange are famous and trusted people, that's why people believe and trade on their site. Furthermore, exchanges has make great amount of profit from traders which we know as withdrawal fees. But, you are right, better not to save coins and money inside for a long time.