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Google has replaced the Google Assistant app on Android with Gemini by default
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
It looks like you can switch the assistant to the old one, and then turn that one off.
But just like Microsoft, Google is going to use this technology everywhere. If in the future (or now, if it is already available to you), you use features to describe images, summarize data, create texts, you probably will be using some form of Gemini.