People who copy signals from groups on social media are not traders, you might as well call them gamblers because that's what they are...first of all, copying trading signals from traders isn't really a bad idea but the problem with this is that the more you do it you would not understand anything about the market and how can you be Called a trader when you don't even know how the market works...learn how to analyze and trade by yourself, you'd get better overtime
Yes, you are right — blindly copying signals and trading reduces the opportunity to learn a lot. But whether it is trading or gambling depends on the person's intentions and interests. If someone uses signals as a learning tool and also learns analysis on their own, then we can consider it as part of the business. The main thing is to understand the market, trade with risk management — not just copy signals, and try to understand the reason behind it. Slowly, if you learn with understanding, you will build your own base.