Google and the companies it considers its competitors in a given space (e.g. primarily Microsoft in "workspace" and cloud storage, for example) have already demonstrated for over a decade that they're willing to use any data you store in their services for any purpose they feel like, and often much of this is written into EULAs, but also it doesn't seem to matter if it isn't. I hope that if this is your first exposure to this basic fact, it encourages you to stop trusting google and look for alternatives with auditable guarantees