google meet is part of their office suite, called google workspace. the higher tiers of google workspace include access to the paid tier of gemeni.

also, in a previous iteration of google's AI branding, meet had a feature that would create llm-generated meeting notes for you. i'm unsure if this still exists

https://www.theverge.com/2023/8/29/23849056/google-meet-ai-d...

It's not related to Gemini. I suspect they're putting non-LLM stuff behind the Gemini paywall to make Gemini look more profitable than it is. Like most LLM rollouts, it could maybe become cashflow-positive, but it will likely never be profitable because of the many billions it takes to compete with OpenAI and Meta.