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

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"

The Tribez: Build a Village The Tribez: Build a Village
"Some challenges require you to have friends. Having a few friends is useful as you can earn rare resources by "helping" them They are also useful in completing Dino competitions (Snowman, Fire Mountain etc)."

The Walking Dead: Survivors The Walking Dead: Survivors
"Referral rewards, more rewards for more players invited"

Bingo Blitz™ - Bingo Games Bingo Blitz™ - Bingo Games
"Invite your friends, double your coins… really?"

Life Makeover Life Makeover
"There are rewards for sending out invites."

Tiny Tower Tiny Tower
"There are levels of benefit for getting more and more friends hooked (to a point, I think; I've never done it)."

Coin Master Coin Master
"You get more coins, spins, etc. when you invite friends to play"

War and Order War and Order
"Referral rewards"

Fishdom Fishdom
"you get free stuff for inviting people"