Would INTERNS do? INTERNSHIP is a bit long, and I don't like +INTERN; we like HN threads to consist of plain, good English. It's moot anyway because half the posts would ignore it.
Clamp down on those. Moderators should moderate.
Half the posters already ignore and won't even mention if they allow (or not) REMOTE. These should be removed by the mods and downvoted by everyone else. You'd only have to do this a few times before people wised up and started putting effort into their posting rather than just copypasting their job posting from all the other job sites out there.
Our cycles are limited. If we spend time doing that, we won't be able to do other, more valuable things for the community. Plus we'd be miserable, and also you vastly overestimate our power to induce compliance.
I agree, though, that copy/pasting job posts from other places goes against the spirit of these threads.