This question has been answered a few days back, but don't worry I would like to answer it again. Actually, people create crypto signal groups or trading groups in order to earn money for sharing their signals so that they can earn a good passive income for them for a long time and also they use this groups for selling some marketing products or in order to make some lists for their marketing purposes. There are only a few groups which share their trading signal services with a good accuracy and at affordable rates otherwise all the other are for marketing purposes.