Facebook, Instagram, etc... these are all only valuable as network effect monopolies.
Investment into AI can torch billions of dollars and still be worthwhile so long as it's done in the service of protecting those monopolies, because LLMs are both intrinsically threatening to Meta's existence and intriniscally valuable for building better recommender systems when platform monopolists like Apple add privacy protections (cutting Meta off from the data spigot that powers its revenue streams).
Once AIs with no wallets outnumber humans on Facebook, Meta has an existential problem. There is no way to avoid the inevitable, the best one can do is embrace it, and 25 billion is nothing compared to losing your platform.