Gmail doesn't pretend to be private.

It sure seems to.

> When you send an email or text message, send attachments, or record video meetings, it is stored securely in our world-class data centers. Data is encrypted in transit and at rest. If you choose to access this data offline, we store this info on your device.

> We do not scan or read your Gmail messages to show you ads

https://support.google.com/mail/answer/10434152?hl=en