[matkoniecz]

> Why website owner should be bothered by it?

at least following cases would cause this:

(1) They are disliking tracking

(2) They are disliking Google

(3) Google is competing with them

(4) They want to be liked by people disliking tracking or Google

[Flimm]

(5) they don't want to help other competing websites to steal their customers using targetted ads