Instagram is a two-sided market, and its users were never the customers

Instagram users pay nothing to post, and that is the design working as intended. Meta earned over $196 billion in advertising revenue during 2025, almost all of its revenue for the year. Instagram is a two-sided market: an intermediary that connects two distinct groups and profits by helping them find each other.

Meta subsidises one side of the market and charges the other

Jean-Charles Rochet and Jean Tirole showed that platforms of this kind cannot price each side in isolation, because demand on one side depends on how many people are active on the other. The profitable move is to subsidise the price-sensitive group and charge the group whose willingness to pay climbs fastest as the subsidised group grows. Meta reported family daily active people of 3.58 billion across its apps on average for December 2025, and almost none of them was billed a penny. Advertisers were.

Adobe learned the same lesson with the PDF. Sales only took off once the reader was given away and the writer was priced, because the free side was what made the paid side worth buying. Games consoles follow the pattern too, sold at a loss to build the installed base that developers then pay royalties to reach.

Follower counts are the signal the money side actually reads

The two sides are joined by network effects, the situation where a product becomes more useful to each user as more people use it. Every additional user makes the platform more valuable to advertisers, and a better-funded advertising market pays for the free service that draws more users in, despite the ads. For an individual creator, that whole mechanism is compressed into a single number. A follower count is a rough proxy for the audience an advertiser is buying, so it works as a quality signal in a market where the seller's inventory cannot be inspected directly.

The subsidised side faces the highest barriers to entry

Free to join is not the same as cheap to compete in. New creators meet barriers to entry that are structural rather than financial: recommendation systems allocate reach on the basis of engagement, and an account with no audience produces no engagement to allocate reach against. Some creators respond by paying to cross that threshold, choosing to buy instagram followers rather than wait for a cold start to resolve itself. Whether a bought head start attracts paying advertisers is a separate question from whether it moves the number on the profile.

Inflated audiences push the mispricing onto advertisers, not the platform

This is where the two-sided structure produces a real market failure. An advertiser cannot easily tell a genuine follower from a purchased one before signing a contract, which is a textbook case of asymmetric information: one party to a transaction knows more about the quality of the good than the other. The cost lands neither on the creator who bought the followers nor on the platform collecting the advertising spend. It lands on advertisers, and on creators with real audiences whose rates fall when buyers discount every account to cover the ones that are padded. That second spillover onto people outside the original transaction is an externality, and the pricing structure gives the creator who bought the followers no reason to pay for it.

Platform governance therefore carries more weight here than it would in an ordinary market. A shop that sells a faulty product loses one customer of its own. A platform that lets the quality signal on one side decay reduces what the other side is willing to pay for access to all of it, which is why the platform, not the creator, carries the cost of policing fake engagement.