The extent of the amount of processing that they do with your data really came to light for me when they and the local police had to explain how they knew about a guys kiddy porn collection that he would zip compress and email to himself...

This was back when gmail introduced antivirus and antivirus rules for attachments in email yours or attachments sent to you. Many years now.

The zip file and it's contents where known to be scanned because google virus scans all attachments. It is part of the service you must let them scan for threats.

What this one pedophiles porn stash reveled is that the zip files are not just virus scanned they are decompress into memory on the fly and individual files are not just scanned for potential threats but the images, videos, audio, everything is sampled over and over against multiple algorithms until they face match and or body match people or positions / poses / events / conversations and all the telemetry data that it generates.

They say as a human does not look at the pics so it is OK. The algorithm is able to flag it as having ID'ed kiddy porn with out human intervention.

The EULA (End User Licence Agreement) is where you agree to waives most legal rights and objections away. They enforce the TOS (Terms of Service) the terms you agreed to.

Wait until they have Google Home, Alexa, and Facebook's Portal testifying against you as witnesses in law courts.