Earlier quoted context omitted.
Twitter and YouTube don’t make profits, yet are still wildly successful. With a high enough amounts of hype, stock price, and money, a company can stave off reality in seeming perpetuity.
I’m fully convinced that YouTube not making money is some sort of accounting trick utilizing the fact that it rents bandwidth and compute from Google.
Netflix eases that problem by providing ISPs and other interested parties with racks full of what are essentially ultra-performant NAS systems [1] for free, but that's only realistic because the utter majority of Netflix's load comes from their top movies/series and it saves them all the egress fees and the ISPs a hefty chunk of their connectivity needs - ~15% of all Internet traffic is Netflix [2] and even serving a quarter of that by ISP-local caches takes off a lot of load.
Youtube, Vimeo and their smaller competitors, in contrast, have way too much different content to make such an expense worth it.
[1] https://openconnect.netflix.com/en/
[2] https://www.statista.com/chart/15692/distribution-of-global-...