Netflix spends over 50% of it's revenue on content production and licensing ($17B out of $30B), and they made $6B net profit in the past year.
Sandvine is the usual source in the industry and they say: "Sandvine's 2023 Global Internet Phenomena Report Shows 24% Jump in Video Traffic, with Netflix Volume Overtaking YouTube"
https://www.sandvine.com/press-releases/sandvines-2023-globa...
Netflix needs (1) a copy of say Top Gun Maverick (And maybe variations for different resolutions), YouTube needs a bazillion Copies of it with small variations, clips with different music, people "commenting" on it, people actually making commentary, Highlights, YTP's, etc all of it with a wider range of resolutions and also to way more people, plus the overhead of checking against their master copy of copyright infringement