The truth is that most people don't really care. A lot of them don't even know what an OS is, they just need a machine that lets them browse the internet, write documents, and maybe play some games. An ad is maybe an annoyance to them, but not one that's going to make them install a new OS. It's not because they're dumb or ignorant, it just doesn't rank that high on their list of priorities (even if we think it should). I think being in these communities kind of makes us forget that a lot of people don't think that much about tech.
I do think that easy to install/use Linux distros could one day start changing some minds, but that distro won't be one that's popular with current Linux users. You'd basically need something that very rarely requires you to touch a terminal, even for troubleshooting, because that's where people will nope right out.
On the other hand, this is why stuff like that "look at all the data Google has on you" video are important. For us it's a yeah duh moment, but the average Chromebook user probably has no idea and is rightly surprised about it. Reach people in terms they can understand.