For ads at least the argument can be made that the content you consume is not yours and as such you should not be allowed to choose how it is monetized.
Google unilaterally deciding this is like Firefox or chrome adding ads to websites. Which is like no... They're the medium through which content is consumed.
Not to mention just about every "serious" app (gov't, banking, etc) check safetynet before even turning on. (Hell I've had a gov't app refuse to start because I had developer options enabled, on a completely 'clean' phone)
So emulating them isn't gonna work and websites do not always prioritize working on mobile anymore ("just install the app")