Initially, streaming had to compete with broadcasting's long seasons by producing the equivalent amount of content, spread between more shows, with higher-quality production but much shorter seasons. Now streamers are providing fewer shows and only semi-annual seasons. It ends up leaving a lot of open viewing time with nothing fresh to watch.
YouTube also has the advantage of people making highlight reels of the most popular movies and series. We get out-takes, behind the scenes, bloopers, best quotes etc. Streaming services haven't figured this out (yet). I've never watched The Late Show with Stephen Colbert on TV, but I watched almost every monologue on YouTube.