The first behavior to apply is to stop going to signal providers.

The people who run such groups will take money for no reason as "membership fee" with or without recurring fee and then dump their shitcoins on you so they can create a fake demand and sell their coins. These two are the methods commonly used by such scammers to get money.

They are rampant because nobody wants to learn trading the hard way or actually do dummy trading to get an idea of how the market works.