FWIW, I'm a student, so there are at least a few still here. Feel free to ask me any questions (either via email or via replies to this post) and I'll try to answer them.
I don't think that any of them do, but I'm a Canadian math/physics major, which is slightly outside the target audience for HN.
> of the ones who don't, what do they read instead?
For the social aspect: mostly medium-sized Discord servers. For the news aspect: nothing at all. Both of these do have some advantages, but it's still a bit of a shame, because the Discord servers aren't indexed by Google, so they're hard for outsiders to find, and not reading the news means that they're missing out on some of the cool new tech advances.