2k feels very small considering the number of business sites that embed Google Maps. I guess a lot of those sites use other website building services that handle the Google API keys for them, and/or they're old and untouched enough that no one enabled Gemini on them.
I had the same thought. I guess a lot of those keys may belong to dormant/deleted accounts and only a % of people who have enabled Gemini (presumably it required user action)