Obviously it’s possible. And just like the early internet ad networks…

You can’t guarantee they’ll be shown and interpreted correct by the downstream LLM, you can’t guarantee attribution later when a user makes a purchase, you can’t collect (as much) data on users for targeting, etc

The biggest ad networks today (Google, Meta) have strong first party data operations, strong first party attribution techniques, and strong targeting, either through intent (search) or profiles (meta).

MCP originated ads really only threaten Google (via intent based ads), and they’re quickly moving I to owning the UX of LLMs, securing their place in this value chain.