It’s because NBC/Universal owned those shows, whereas Fox (the network) is a different company now from 20th Century Studios that produced most of their shows.

Since NBC owns the shows, they’re able to put them all up on Peacock, and since Peacock’s still relatively new, and they knew the shows performed so well on Netflix, they use those social channels to entice people to sign up for Peacock.

A bit of this is demographics too. FOX had some hits but the studio change means they don’t really want to promote those older shows. ABC is owned by Disney but a lot of their big streaming hits (Ugly Betty, Desperate Housewives, Lost) never got the same level of Netflix exposure. CBS tends to skew older so wouldn’t invest much in social, but they do a hell of a good job putting nearly everything on Paramount+ and were first to really get that network/streaming integration going.

As of right now, NBC and CBS are the best positioned for the modern day offering all their network content, plus live feeds of your local station, on Peacock and Paramount+ and are very consistent and obvious about where to stream things.

ABC has Hulu, but they don’t have the live stream available, and since Hulu’s still in a bit of limbo for the next year, they can’t get too close.

ABC also has to basically take third-picks at Disney content. If Disney’s making something high budget, it’s going to Disney+ first, and Hulu as a backup if it’s too adult themed. ABC becomes the third pick and has to exist in a weird middle between family-friendly and adult themed.

FOX is probably in the worst position, they put their shows on Hulu but a lot of their scripted content isn’t owned by them, but 20th Century Studios (Disney). That’s why you’ve seen FOX more than anyone else lean into reality television they can make in-house. They also don’t really have a great streaming strategy. Most of the stuff goes to Hulu, some also goes to Tubi, but it’s kinda inconsistent. They also don’t offer a live feed of the local station like CBS/NBC do.