The rest who want to stay are only there because they're making incredibly high amounts of money thanks to being at the company just before it went public. (They joined 5+ years after the company was founded - hardly part of the original gang)
Has no one ever been a manager? Have you never worked with managers who had to do these things? I've known many managers who admit to having to do all of these things. Some of them are proud that they did it - some are ashamed because they didn't want to but ultimately had to otherwise they would've gotten fired.
Ultimately, it doesn't matter whether you do it because you enjoy it or because you have to - what matters is that you're doing it and someone is on the receiving end.
Genuinely - how many of you have ever done hiring while searching for a new company yourself? HN is truly full of the self-indulgent and self-righteous to think they're not doing this themselves or that this is wonderful to be around.
There are circumstances where this is ok and others where it isn't. Is it ok to hire for a company that you're retiring from? How about one where you can't continue to advance but you think is a great environment? What if you were at a startup that got acquired by a megacorp and you focus on hiring people who enjoy a big company environment?
IMO, so long as you are transparent about the pros and cons of the position, it's perfectly ethical and reasonable.
How often are people genuinely leaving companies because they think it's a great environment but it's just not for them? How often? 80%? 50%? 1%? (I'm guessing closer to 1% than 50%)
But at this point in my career I'm likely much more deliberate than average about making sure a role is giving me what I need as well as more deliberate than most managers about trying to find good all-dimension fits for my positions.