>> not only has Google given themselves the right to scan your documents

> You agreed to it:

I highly doubt that: "clicking agree" and "agreeing" are two entirely separate things.

Literally no one has the time or ability to read, let alone agree, with the things they're forced to click through* in order to live in the modern world.

Therefore, Google gave themselves the right as the GP claimed.

* either literally by clicking through, or by opening up a box an using a product, or by having something like that silently and unilaterally amended, etc.