Copy trading can't guarantee any results, just like no form of trading can. In escense all you're doing is copying the trades of somebody else, so unless you believe someone else can achieve 1.5% a day guaranteed (and you can find out who that person is and are allowed to copy their trades) then this isn't possible.
Exactly, the only thing I see with copy trading is the aspect where you know obviously that you cannot trade yourself, and you are looking for a good trader that you can auto copy his trades anytime he is making one and last time I checked, there is no retail trader that will tell you or any platform that will tell you that 1.5% daily return is a guarantee as it is impossible.
In situations like this, I would question such platform a whole lot, and thank God for the internet which I believe you can easily get to find a whole lot of reviews. However, any platform that promises you something that is too good to be true, you really want to be avoiding it.