I remember watching a video about it from Side of Burritos on Youtube.
I am to new to these types of things to really gauge how big of a deal this is. Is it recommended to either have a black background or something very popular or is this really only a concern for people with extremely high threat models?
There are so many other ways for native Android app developers to fingerprint devices that this is virtually irrelevant. The Android app sandbox is simply not designed to prevent fingerprinting in the first place.
As far as I’m aware, the APIs in Material You to grab this color information aren’t made available to websites, which is where the real fingerprinting problems would begin, so I’m doubtful this would actually impact anyone.
Firefox also uses them for page widgets too, but the browser will always protect them from the website.