These signal groups have been popular for years, and to be fair you can find some decent ones. It's very profitable for people to learn trading techniques and then leverage these to provide signals and get people to pay for membership. It's hard to consistently be successful though and a lot of them seem to lose interest/make enough money and then pack it in.
One thing infuriates me with these signal traders. If you have two coins and one makes 15% profit and the other makes 20%, this DOES NOT EQUAL 35% profit. It's awful maths, and I see it from all of them...please, take these claims with a pinch of salt. These are people who don't even understand percentages nevermind the complexities of trading.