There’s no way this profit all comes from YouTube
Personally, I doubt YouTube bring in any net profit. In fact, I think wendover just did a video about how expensive/hard it was getting Nebula up an running that that is at a fraction of the scale of YouTube.
Look, its hard defending Alphabet here, but things will enshittify if they don't have a clear and sustainable funding stream.
Even these Fediverse instances leave me with the question of how will they be paid for. Donations won't scale and any sort of monetization is...resisted.
Here: How We Built a $150 Million Streaming Platform with $100,000
Its a little braggy, but justified I guess.