The arbiter of truth is https://killedbygoogle.com/

An "LLM-based product" is any product with LLMs as a central feature, such as Gemini.

A product that incidentally uses LLM features doesn't count (e.g. if gmail spam filtering used LLMs, then somehow ceased to exist, that wouldn't count)

If https://killedbygoogle.com/ ceases to exist or becomes inactive then the market may be resolved at my own discretion (product cancellation announcements are usually fairly explicit, in any case).