An advertisement that lies about what is actually in the game. These ads will interest people and tempt them to play the game. Then, once they play the game they will realize that it is not what they actually wanted and the game will get another installation. These can be spotted out by the ads having an animation instead of gameplay, ads that have that red fingernail girl's hand swiping around the screen, and the use of stock sound effects. Fake ads also have a very low budget. Some fake ads will use tower defense advertisements or other fun or exciting game types when in reality it's just another boring kingdom and civilisation building game with multiplayer battles.
This is usually how a fake ad will go:
Character is in trouble.
Floating hand presses buttons attempting to save the character, but instead making it worse
Big red circle with "FAIL" on it pops up, trying to tempt the watcher to installing it to see if they can do it themselves.
Other fake ads are ads that include sexual or kinky content. These ads will usually have the player or hand in the game trying to use an eraser tool to shave the women's clothes off. Then, right before they strip them, the advertisement stops or the hand will stop doing it.

When you eat dirt for the first time and leave your family to build a shack in the woods