Why do you think these apps can predict what happens to the market?
99% of the time when some app or signal group claim that they know what happens in next week/day/minute in the market they're just lying and it's not true.
Have you ever asked yourself if they're so good at predicting what happens to the market, why they need to create an app/signal group to make money, why they just don't make money using that data?, like shorting with leverage when they know bitcoin or some altcoin is going down, or longing with leverage when they know it's going up? wouldn't that make more sense if you're so confident about the prediction data you're providing?
Nobody should really think they could predict the market, there is nothing that could predict the market, but that is the selling point of all scam artists. At the end of the day if you are going to end up with almost nothing at all, it means that it is a scam, even if the seller actually believes that they could make a profit from this, and fail to make it, that is still involuntary scam.
You sell something that suppose to make people a profit, and you use it yourself, and you make profit, and you let others use it, and they fail and not make any profit, that means it is still a loss and a scam. So, all these prediction applications are scams because technically speaking nothing can predict the future, there is nothing like that. So this means there are scammers out there and there are people who think this would work and get scammed from it as well.