Aggregators

Aggregators have these 3 characteristics: Direct relationship with users, Zero marginal costs for serving users, Demand-driven multi-sided networks with decreasing acquisition costs

Because aggregators deal with digital goods, there is an abundance of supply; that means users reap value through discovery and curation, and most aggregators get started by delivering superior discovery @Ben Thombson - Stratechery

Reference

https://stratechery.com/2017/defining-aggregators/