Good point!
For the sake of accuracy, Hulu is owned by Disney which also owns ABC, as well as ESPN, Marvel, and Fox Entertainment (but not Fox "News").
Meanwhile, a couple years ago, CBS and Viacom merged to become "Paramount Global" which owns both CBS and the Paramount (streaming) Network (obviously) as well as a slew of cable channels including Showtime, MTV, Nickelodeon, BET, Comedy Central….
And as noted, Comcast owns Universal which owns NBC. Their streaming service is "Peacock," which has yet to demonstrate that it can compete against Disney's Hulu (or CBS's Paramount).
This may soon change, however, as licensing agreements expire and corporations begin to run their own content exclusively on their own networks. Disney-owned content will stream on Hulu, Universal-owned content will stream on Peacock, and Paramount-owned content will stream on Paramount. Same goes for all their respective cable TV channel subsidiaries.
This consolidation in media ownership gives more power to the corporations to compete against one another in the emerging streaming-service market, but it also takes power away from the people who create the content. This is a big reason why the screenwriters and SAG are on strike.
I've been trying to do my part by watching reruns of The Nanny in demonstration of my support.