Trading is a difficult job to some people, Binance is only trying to bring people that are having less interest to trading, more like a short cut but this technique of trading will burn plenty of hands. It will be profitable perhaps when we enter bull market but even the real traders avoid trading during bear market, only the traders with coconut head(stubborn types) trade that time and mostly lose money because they trade futures to short market and we all know how dangerous future trading can liquidate accounts quickly.
As you also said, more fees for exchanges. Binance isn't the only exchange I have seen with this featurebof copy trading, okex has it already. I'm not sure about Kucoin but if they don't yet, they will do that as soon as possible because they wouldn't be the last people that will not enjoy the fees.
I will not advice any trader to indulge in this sham trading, in the long run they will run out of market because been too independent on another person is really really bad for a trader. Mroe like a trader that copy signals from one telegram group to another and when the Telegram group is deleted, you will be helpless.