Yes, OEM unlocking is an option that you can toggle in the developer settings in the 11. I haven’t done it personally, but it looks like it’s the standard process via fastboot.

There might be an invert colors option in the notification drawer. Swipe down from the top of your screen and see if you can find anything that might do that.

Not trying to defend Google, but they don’t actually sell your data. Their ownership of your personal info is their biggest asset, so they wouldn’t easily give that data up to others. Instead. They serve ads to you on behalf of other companies based on their ad targeting criteria.

I dislike Google and their entire business model, but I do at the very least trust them to keep my data captive within their own ecosystem, as hideously enormous as it is.