This kind of problem is also showing up on Quora. Some of the answers I've spotted are so obviously wrong that you can tell a person didn't write them.
The problem is that Google actually has support for quotes, even if it's not reliable. Try searching for short song lyrics or poetry, or pretty much any obscure quote on ddg and you can't find it. Putting individual words and phrases in quotes does nothing on ddg unless they suggest it for you...in which case it often still doesn't work
So many people were clicking on the link from here that it inadvertently DDOS-ed my server. I had to turn on the "under attack" feature in Cloudflare just to get the other sites running again.