They did that to drive up short term ad revenue and it worked, and joy was in their greedy little hearts. They also did figure out that poisoning search results drives away users, and that search is kinda the fastest gateway drug to their entire ecosystem.
But they're stuck. Fixing search would lower their ad revenue, and stock holders would kill them for that.
Probably provoke every neighbor until it's a big active conflict in the entire region and then say they're the only one capable of "maintaining peace" aka kill everybody so better start sending weapons.