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.
Just think about this - if they are indeed winning every bet they are predicting, they will exhaust this strategy up until they have tons and tons of money. And if they do really have a lot of money already, they won't have time to screw people as they will just enjoy their winnings somewhere in the tropics drinking their piña colada. So don't believe such offer as they will just scam gullible people. If the offer is too-good -to-be-true, doubt about the authenticity of the intentions. Very rare nowadays have a good heart that will truly will take care of your funds. Most are after for what they can get as much as possible from their potential victims.