Microsoft, Apple, Spotify and Netflix aren't trying to build out social communities, and therefore vending user-created video doesn't really align with their corporate vision. Also, none of these are ad companies (Spotify maybe). Netflix already has a process by which they carefully fund programmes to be produced, and comparatively, Facebook, Twitter, Twitch and Tik-tok, do compete with youtube in the video and ad space, in a sense, however except for Twitch and Facebook they don't pass revenue to creators.
Anyway, Google has demonstrated the model is a money-fire, even if you operate the largest ad network on the planet. Videos are increasingly expensive to vend, particularly as video quality expectations only get higher, digital rights management is a unending nightmare and moderating content like that is a non-trivial proposition too, particularly to keep advertisers happy. Vimeo has demonstrated this too, as revealed by the service charges they slap on uploaders for popular videos. For google, however, youtube is a loss leader, I guess, as it builds out their ecosystem, and also it has clear market dominance, which is easy to lose and difficult to acquire later if you want it.
So, in short, consider what the purpose of a tube site today is:
1) Eyeballs on ads, and,
2) A community, to facilitate point 1.
It's clear why companies don't rush to this.
I would say that maybe the only outstanding opportunity is some substack-like setup where people directly pay for user-made content and hosting costs are embedded in there? Google is starting to tap this market as well, with channel memberships, early video access and rewards, and also through superchats in livestreams, so maybe there's not even an opportunity there.
-edit-
In fact, thinking it over, Microsoft did actually throw their hat in the game with Mixer, which was an expensive failure. This is actually a great example of the difficulty in moving into a dominated market. Unless you can burn money for years (mixer) to maybe make it, or outclass the competition technologically and find a new paradigm (twitch, tik-tok), it's very hard to get in there. Look at how hard Epic Games have been trying to unseat Steam as a dominant sales platform; it's been years and they have spent truckloads of cash on game studios and giveaways and they're still not an equal player.
Mixer agreed to transfer their content to Facebook's streaming service in the end.