It seems to be the combination of two things: Diablo is now truly a mass market product, not just a gamer’s delight. Games now make more money than movies. The audience to be reached is enormous and attracts the eye of infotainment professionals, and no longer just people who are really into the game and decide to maybe try a guide. These people start with the cheap content machine first and Diablo is just the topic du jour. after a while they will be on to something else.

All this points at the second topic, which is the way paid creator video platforms have evolved. There’s now significant commercial opportunity and competition is fierce. No longer does the deeper guide win but rather the one that games the algo most, appeals to the broadest audience most, and has the most production value (money) behind it.

I suspect there is actually more high quality game guide content than ever, but you aren’t going to find it with just a “Diablo” search because there is an enormous pile of cheap crap on top of it.