Many of the most popular streaming shows were originally aired on broadcast TV (which most people watched via cable) - The Office, Friends, West Wing, Big Bang Theory, etc. Or originally for cable channels - Breaking Bad, Walking Dead, Suits, etc.
Netflix has produced a few decent shows but most of its stuff is "targeted towards morons" or "pure garbage that insults my intelligence" - Love is Blind, Is it Cake.
Commercials arent great but they are passive - easy to ignore. Much rather have a 3-minute commercials break where I can go to the bathroom or check my phone than having to actively scroll for 90 seconds switching from app to app and navigating their awful interfaces to get back to the show I was watching the other day.
But that's just me - glad you like our new television overlords, they certainly love anyone bashing cable tv!