Because if you say you give a fuck about privacy, and use a modern android phone with OEM rom or an iPhone, you either don't understand what privacy is and shouldn't be talking about it in the first place, or you are a hypocrite.
Modern society enables miracles.
But thanks for proving the part of "not understanding what privacy is" part of my post.
For the sake of not playing an analogy war, let me just say this: if you use a modern device with OS made by Microsoft, Google or Apple (or derivative of), you are implicitly consenting to very large amount of personal data collection, which you have no control over. If you choose to trust those entities for whatever reason, thats totally fine, but your particular selection of trust isn't "correct" in the sense that it should apply to everyone, because it has no concrete objective basis. And therefore, you shouldn't base what you think the law should be on it.
It’s also possible they understand the trade off with privacy wrt, say, google and their isps/mobile providers, versus the trade off with random websites on the internet.
It is absolutely relevant; it is arguably the most relevant question. It lies at the basis of the entire concept of "threat model" in security.
The police wants to track you to investigate you as a suspect in a crime. Facebook wants to track you to know who you are talking to. Amazon wants to track you to learn what you might want to buy. The Chinese government wants to track you to know if you might work for or against it. And so on.
I, like most people, give wildly different amounts of shit about every single one of these agents, and take different levels of precautions as a result.
In case its not clear, because Im really doubting that people have a good grasp of privacy here, when you buy an Iphone, it phones home quite a bit collecting pieces of data about you that Apple can and does use internally for their advertising purposes, and you cannot opt out of it.