For example, the signal is known by 1000 traders and they continue to buy, so the price has been pushed up naturally and the signaler will take advantage of the opportunity to sell at a high price.
This is one of the tricks of the signal generator. Don't believe them.
It all depends. I have an acquintance who joined signal group worth $100. It is not working 100% but it works most of the time. If you are most of the time a btc trader, you can actually test it in a span of two weeks. They have a trial period and you can easily spot if it really works or not. But if you are hesitant, just be independent and try to learn technical analysis. It maybe a big help to you as a trader.
I would not say we should not give signal a try, but it is better we still have an understanding of analysis too, so that we can cross check the signal when we get any before we apply it to our trade. Most people that do go for signals are people that wishes to trade but do not have the time to read charts, but can still just briefly verify any signal they get for accuracy.