It's more so everyone is adapting to the changing times than it is about everyone wanting a slice of the pie. Everyone was in some way a direct to consumer distributor. Netflix had multi-billion dollar DVD mailing service, Apple & Amazon had multi-billion dollar digital distribution busineses, Peacock, Paramount & Warner Bros are self-explanatory. Nobody wants to just let their business die instead of adapting while the ones who also create content who rely on sister companies to order their shows consisntetly aren't going to want to be in a posirion where they hope Netflix chooses to order new shows.
The problem with Netflix being the one stop shop is that their model does not support unlimited content in the same way that YouTube or Spotify does and that's mainly because TV/movies is really expensive and so unless you have advertisers greatly footing the bill, you are going to have to pay for one realy expensive streaming service with Netflix. Netflix never had everything, if you combine the library count of every service it's multiple time larger than netflix ever was. Even if they used to have more that was from a time when Netflix was anciliary revenue for content owners/creators. If digital is declming, liknear TV, is declining ondemand/ppv is declining , theater declning, retail is declining, then it's on track to become the sole/primary revenue.
Lets say you are fine with a really expensive single streaming service, do you really want one company to have a monpoly? One company that decides what shows get to live what third party company gets to eat? What if they stop ordering shows from third-parties because vertical integration is way more econmical? What if they pass on a realy good idea that never gets made? You know that right now many super popular shows have been rejected by competition. Monopolies are almost always convinent. If Amazon was the only online site ever that'd be convinent, if you could get everything at Walmart retail store that'd be convinent too, if everyone just made games and played on PlayStation things would be convinent. But we don't want a company to have so much power because it lets them take advantage and competition leads to a lot of innovation and motivation for better things. Look at the TV industry right now where we have these companies spending more than ever trying to create the next big show(s). Yes it's inconivnet to have multiple UIs but I'd take some strong competition motivated to create great content over a unified UI
