Why is a thirt party app icon grey like first party apps?

VeebeeAnn

I downloadet an browser app called "swisscows" which is a web browser.
It's icon was grey.
I thaught only first party apps are grey?
Or is swisscows made by grapheneos developers?
Somehow when i used swisscows it happend often if not everytime, that i landet on vanadium. I think when i clicked a link in swisscows it opend in vanadium.
This was confusing me so i deleated swisscows but i still want to know what it was up to.

Xtreix

VeebeeAnn Swisscows is a search engine, not a web browser, that's why Vanadium opened while you were using Swisscow. It's not a GrapheneOS app and the color you describe is just the original color of the app.