They are completely useless. For them to be useful, they should at least explain why the sky didn't fall everytime they said it would fall. In 2013, they called the end of the China debt bubble. Runs to get cash from the ATM. Wealth management products maturing and no way to refinance them. It was a certainty they said. Then absolute silence for 6 years. No explaination on how the system is "rigged" even.
I used to read ZH during the financial crisis years. There were surely some informative news stories that they broke earlier than the MSM. However, between the financial crisis and now, the site has devolved into a right-wing, conspiracy-theorist, antisemitic, racist, homophobic, hate-speech cesspool. I don't go there anymore.
ZH is, on balance, worse than worthless; they are pernicious Where they are accurate, there are more reliable sources; where they are wrong, which is often, they are dangerous.
On the plus side, they have predicted 27 of the last 2 recessions. It's always funny when someone quotes them here and seems to actually be unaware of their standing, kind of like when someone quotes Breitbart or Vox as if they're an authoritative source on some political topic.