/co/ has not been love for about a decade now. The concept of how 4chan functioned was lost when it became publicized.
Previously, the only people that really talked about 4chan were /b/tards, so they would invite their friends to /b/, and thus /b/ became the landing board for all newfags. Eventually people would tire of the board, or just get curious enough to find something else, and migrate elsewhere. During that time, they learned how 4chan worked. Once it hit the news around the time of Chanology, though, people just started looking at everything. Nobody understood a thing, and the concept being a snarky contrarian simply for the sake of doing so took hold, because that's what 4chan looked like on the surface to newnewfags. Personally, I also think the creation of too many new boards drew people away from /b/, which reduced it to really having no purpose.
Now 4chan is predominantly shitposting and bait threads with people desperately trying to dislike everything they can, mixed with companies trying to low-key advertise here (/g/ got it REALLY bad back when Windows 10 was launching). It amazes me that it doesn't get boring to the people that do it, but whatever.
tl;dr - 4chan got flooded with too many newfags that weren't told to lurk moar and got 20 new boards to be retards on.