Monetization will come with agents that take action on your behalf (reorder dinner, find and buy a gift for your niece, make dinner reservations). Bots will take a cut of every transaction, and intake ads to steer recommendations.
This sounds suspiciously like that idea that Alexa would make sense because people would order shit from Amazon through voice based assistant.
I seriously doubt the vast majority of people would trust actual purchases to LLM agents that have the inherent feature of being possibly very inaccurate. If I have to review my orders, I would rather do those actions myself than having the extra step of having agents do it on my behalf.