It is a common sight to see exchanges out there which are created solely to cheat unsuspecting traders. This exchanges might go offline all of a sudden and even leave with users funds and profits. The webpage of most of their exchange become broken and have a broken URL, hence no one can trace them. One of such exchanges that I'm still skeptical about is Coinopts, this exchange should be carefully considered. I never got to use this exchange so I wasn't scammed but for unsuspecting new users, I would advise you to stay away from this exchange. According to my own personal research this exchange had its last twitter post in September 2018 and currently has about 11 followers, this is a great indication that this exchange is an unpopular scam exchange. It seems like this exchange isn't organized as they have no known achievement and feat. This Estonian exchange was not well funded, this might have led to its early termination as it was terminated the year it was launched. No mobile apps at all as I have searched Google Playstore for any trace of the exchange but no! There is no mobile trading app.
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