Think about everything you do across Chrome, Gmail, Google Maps, YouTube, and everything else Google owns, and you get some idea of how much data you're giving up to the company each day. For most of us, it's... a lot.
Google does at least provide a comprehensive online dashboard you can use to see some of what's being gathered. You can use it to delete everything Google has already collected, stop it from collecting anything in the future, or automatically delete your data after a set period (like three months).
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