[techrat]

Color theme is generated from Wallpaper.

Color theme consists of at least 3 colors taken from the wallpaper.

At least 3 unique colors is enough to make the user potentially uniquely identifiable, depending on how rare the color combos are.

2²⁴ (R⁸G⁸B⁸) combinations for every color times 3 colors means 2⁷² combinations.

And there are color samples taken from potentially two different wallpapers.

Other apps have access to the colors picked for the theme generated from the wallpaper so they can theme themselves accordingly.

This means an app can use your color theme (of 3 or 6 colors) as a nearly unique fingerprint. The odds of collision for smaller apps (sub 1 million downloads) are pretty damn low.