Why the Videos Look Convincing
Because they are edited, and because of survivorship. A person recording twenty attempts publishes the two that went well, and a signal group that sends predictions to a thousand people can screenshot whoever happened to be right. Neither is fraud in the sense of a forged video; it is simply the arithmetic of showing the wins and discarding the losses. Once you know that, the genre becomes very easy to watch sceptically: ask how many attempts happened off camera, and whether anyone shows the sessions that ended at zero.
The other reliable tell is the ask. A demonstration that ends in a link to a paid group, a mod file or a "connect your account" step is not a demonstration, it is an advert with a proof-shaped introduction.
If You Already Installed Something
Revoke every permission it holds, particularly SMS and accessibility access, then uninstall it. Change the passwords of anything you logged into while it was on the device, starting with email and banking. Turn the unknown-sources setting back off. And if you entered account details into a "connector" form, treat that account as compromised and change its password from a different device.
For what the game actually is underneath all the claims, read the chicken roll game guide. If you are trying to work out whether the build you have is genuine in the first place, the ownership and publisher notes cover what records exist and how to read them.