The more popular this gets, the more incentives there are for bad actors to flood hackernews with bullshit. Though I think it's safe to assume it won't be too popular and only a few people will use it for a while.

People want stuff recommended to them from similar people without a profit incentive, that's quite hard to come by... Myanimelist and other longer-form content lists work better because of the nature of the content.

Would love to see something similar with other forums, 4chan perhaps? That's also a forum where the incentive structure doesn't lead to advertising.