So guys I don't know if this isn't a bit too late but here's what I know:
Binance Copytrading only calculates as soon as the trader sells but the 10% goes to him the second you copy him and he buys.
That sounds confusing but broken down here:
Step 1: Buy heaps of Shitcoins, from here on it's pure luck which ones will go up and which ones will go down
Step 2: Sell the ones that go up and keep the ones that go down, Binance will now think you are the best traders with a 3000% ROI in a week
Step 3: People think you are #1 and start buying
Step 4: From here on it doesn't matter what you do you buy every coin whether it goes up or down you collect your 10% and always sell the coins that go up.
Yes it's immoral, yes it happened to me too, but it works (apparently)
If you really want to copytrade, check addresses on solana or ethereum. Because there you can copy people who trade for themselves. If someone knows that he is being copied, he will try to make money from you!