These traders are people who fall victim to the open forum of rags to riches stories of trading from £1,000 to £1,232,2124 in under 30 days. If, no scratch that - when you see these adverts are you enticed by curiosity? Of course you are. Here's a brutally honest fact: If this was possible, do you think the banks would be doing this and SCALING IT so £1,000,000 to £100,000,000,000,000? Thought not.
Unfortunately, people want to make money quickly with zero effort. This isn't how wealthy people earned their living. To trade the FX / Stocks / Indicies you need to understand how to trade or at least receive the right information.
A lot of Signal Providers, whether it's an e-mail blast, SMS service or an App notification are usually triggered by Technical Indicators forming. This could be a break of a support / resistance level or a moving average cross over (a very popular one for the FX automated robots).
Furthermore, the past results pretty much show a clear picture of the same vertical ascent up Mt. Everest. These tests can be manipulated and not close losing trades - which most robots / signal providers don't show.
I know of some signal services out there that are truly powerful and provide solid signals out there. These are provided by market professionals and give a Buy / Sell orders. The difference between looking for signal providers doing it this way is that you know the levels before the session opens and that allows you to place your trades. You shouldn't have to wait for a lagging technical indicator to tell you when to buy or short the market.