In terms of app sandboxing, I don’t think GrapheneOS is doing much to improve privacy, besides sensor and network premission. https://grapheneos.org/features#improved-sandboxing detailed its improvement to sandboxing, but it is more for malicious app, but not for data hungry app, like google product.
In general, an app can only track your behavior within the app besides the premissions you granted (Play service provides an global advertizing ID, which can also be used for tracking, but you can disable it or reset it at any time). You can check these premissions on the premission tab, and the three dots on the top right will show you all premissions.
Yeah but OP’s post is about the U.S. economy and your post is about Trump.
Even though I agree with you completely.