Seriously, the page I've linked to is 2 paragraphs, just read it.
It explicitly states that data IS used for ML training, to provide useful features to the customers:
"Google indexes customer data to provide beneficial services, such as spam filtering, virus detection, spellcheck and the ability to search for emails and files within an individual account."
Individual customer agreements may have more specifications on top, but I don't think any rational company in the world would ask for email without spam filtering because of some abstract fear of machine learning or "scanning" of data.
It explicitly states that data IS used for ML training, to provide useful features to the customers:
"Google indexes customer data to provide beneficial services, such as spam filtering, virus detection, spellcheck and the ability to search for emails and files within an individual account."
Individual customer agreements may have more specifications on top, but I don't think any rational company in the world would ask for email without spam filtering because of some abstract fear of machine learning or "scanning" of data.