Social Pyramid Scheme

You get a bonus for inviting your friends and then they have to invite their friends.

Some games will give you a bonus when you invite your friends to play and link to them to your account. This bonus may be a one-time benefit, or it may be an ongoing benefit that improves the gaming experience for each friend that you add. This gives players a strong incentive to convince their friends to play. Those friends then have to sign up more friends and so on, leading to a pyramid scheme and viral growth for the game.

Often, this is combined with another Dark Pattern called Social Obligation where you and your friends can help each other in the game. This leads to a feeling of obligation and people keep playing the game even when they no longer enjoy it.


Examples

Shadow Fight Arena Shadow Fight Arena
"There a marathon(you progresly get better rewards overtime till you reached a limit)"

Yu-Gi-Oh! Duel Links Yu-Gi-Oh! Duel Links
"I hate the BE Structure pack"

Phobies Phobies
"You get rewards when you invite friends to play however these rewards are not immediate and they have to reach a certain 'stress' level so that you get the rewards."

State of Survival State of Survival
"they offered sports car to invite your friends, and bring them back promos for those that have left"

Roblox Roblox
"Some games grant currency, items or buffs for inviting friends."

Fire Emblem Heroes Fire Emblem Heroes
"Invite systems, albeit minimal"

Cat Mario Run Cat Mario Run
"school cafe"

Honkai: Star Rail Honkai: Star Rail
"Optional rewards for inviting friends"

Dead by Daylight Mobile Dead by Daylight Mobile
"The game is 4 v 1. The game is heavily reliant on information, which is why Survivors prefer to play with friends in order to relay information to help them in the matches. There are incentives to play in clans with your friends to earn currency to unlock extra rewards."

Clash of Clans Clash of Clans
"Clans"