I can tell you pump and dump groups, they are everywhere on every social networking platform, not only on telegram, if you use whatsapp, discord you will also easily find similar groups. Don't blame the app platforms but check for yourself, why do we let ourselves fall victim to them, is it our greed? Do we just want to make money by relying on others? If you are aware that no one else can help you but yourself, I think you will not be in this situation.