I don't habitually scan HN for interesting content, because doing that opens up rabbitholes, and that's a huge time and attention sink if you need to get other

I don't habitually scan HN for interesting content, because doing that opens up rabbitholes, and that's a huge time and attention sink if you need to get other things done. I mostly use HN to keep up with my industry, since it moves so fast. What upcoming services and tools can I now leverage today? Also: what services/projects have gone bust and died because they couldn't sustain themselves?