Some of the bad experiences I have suffered are the following:

- In Etherdelta, in December of last year someone managed to do a massive hack on the web and managed to obtain the private keys of those who wanted to enter over several hours, taking large numbers of ethers.

-In Poloniex, in June of this year they froze my account without warning, and they do not allow me to make any movement until going through an arduous process of verification that does not allow me to start despite my efforts to do it correctly.

-And recently in Cryptopia, where I suffered a hacking attempt and despite blocking my account to prevent it from being looted, mysteriously and without explanation the Cryptopia team granted access to the hacker minutes after I blocked my funds.