A notification popped up on my phone today talking about this. I hit the button to adjust the settings and found that it was opt-out.
No, I don't want my app usage being used for ads. I don't want targeted advertising at all, but none of our fucking countries will take a stand against this shit.
This might be the thing that finally pushes me to switch to GraphineOS.
There was a time that I felt like Google was one of the good guys; they seemed to be doing great things with their products and pushing Linux. Now I feel like I want to de-Google my life.
It's the creepier one, they would know how long you use it, what options you tap or don't tap, where you use the app and much more, who last called or messaged you. That's why you always have to be careful about what permissions an app asks for, you're never going to make a call from a puzzle game.