Copying someone else is not a very good idea in trading,
if enough people start copying a successful trade, you will almost always observe that such a trading methodology will lose its edge and profitability in the near future.
Same is true for algorithmic trading, no matter what your style is, you need to make sure as few as possible people on the planet can figure it out or imitate it...
Totally agree with this.
Some studies about Copy trading shown it is often less profitable for followers on the long term than managing a portfolio manually by themselves, in average.
Copy trading also raise concerns about pump and dump schemes.
Take "signals" groups on telegram for example:
Leader buy first then give a buy signal to the group, followers copy the trade and pump the coin, leader then dump first and (eventually) send the sell signal...
Often a good bet for the lead but can't really say the same for followers.
Copy trading is looking quite similar to this.