I did a test myself and came to a conclusion: automatic copy trading is actually quite difficult to make money.

I set up two wallets, one with 20 sol, one following an external market trader, and the other following an internal market trader. The external market wallet followed with 2 sol each time, and the internal market wallet followed with 1 sol each time. The two wallets I followed are quite impressive.

The external market wallet took a while to lose all, while the internal market one lost everything in just one day.