Why pick on them, for no reason? They didn't do anything unethical, and most didn't seem to even raise a Series A.
You have no clue why they failed; you just speculate... and you don't just name the companies, you call out random founders by name. These people put themselves out there and worked hard, and now they're going to get a Google Alert saying they're in a blog post called "Biggest Y Combinator Failed Startups."
Most YC companies don't work out. In my batch (5 years ago), about 80% are out of business now. That's okay! That's just how it works. I'm all for talking about failures, but it's weird you just pick on a few small random YC startups.