you can't be 100% free software (I reject the term Open Source), you'll always have a device with lots of binary blobs and proprietary firmware. The holy grail of 100% free software is currently unattainable
you can be sure that Valve will sell this data to help data brokers create a more accurate profile of users so they can sell ads and make even more profit
relax, when the industry puts this into practice (not IF but WHEN) they will stick it very slowly in us until we get used to it and don't even realize that we already accept it quietly without complaining
The GOAT