Some may have succeeded, but mostly are not. Copy trading is not really advisable since it will only make your trades fall into failures, and lose everything you have. The strategy that you want to copy may be working for others, but not for you. This is the reason why we have to develop our own since we differ in the way we trade, and the perspective we have in our mind. You may ask for others to ask for guidance in trading, but never to copy their trading strategies.