Commoditise your complements: https://www.joelonsoftware.com/2002/06/12/strategy-letter-v/
Meta has a moat. That moat is the connected graph of users across its various properties, and the (monetisable) attention of those users. Making LLMs a commodity reduces the likelihood that OpenAI (or someone else) will build a unique, unreproduceable product that rivals Meta's properties for attention.