YouTube wasn't profitable when it broke the model of incumbents.
It was an actuality different model from the incumbents at the time. TikTok is the same thing as YouTube, just with different tuning for profitability.
Re:How TikTok Broke the Ad Business
by sharemywin on Tuesday March 21, 2023 @02:37PM
(#35250521)
Even Youtube can't monetize shorts very well.
Unlike YouTube, TikTok is not profitable. It is no surprise they show fewer ads when they are generating no profits. There is no "breaking the revenue model of incumbents" when you are not profitable. Perhaps when they try to be profitable, they will be more like... YouTube.