Basically, what they image (below) means is that - you’ll be added to a group and then the so-called “signal provider” will give you the exact time and multiplier that a specific game (e.g Crash) will get to before it stops.
I have seen similar ads where a telegram bot gives the prediction of Aviator AKA Crash game and the video shows that the player is winning every bet with their signal. It's only possible if someone can understand or discover how their RNG works. Pretty much similar as how a guy steal millions of dollars from Primedice a couple of years ago. But, I believe the developers has been doing their jobs well and we haven't heard anything like that in the last couple of years. So, it is pretty much obvious that those ads are fack as fuck and scams! I would suggest everyone to stay away from these ads and find their own way.