From the dialogues in the pictures it doesn’t sound like they are using anyones emails for training. The messaging indicates it’s more like using as context and/or generating embeddings for RAG. Unless there’s something else I’m not aware of.

I know that Google does a lot of bad stuff but we don’t need to make up stuff they just aren’t doing

This doomsday messaging an alarmism is only serves to degrade the whole cause

edit: and before someone say that they also don’t want that then let’s criticize it for what it is (opting users to feature without consent). We don’t need to make stuff up, it really doesn’t help.