In 2015 YouTube was separated from Google with both owned by Alphabet. My guess is that Sergey Brin couldn’t care less if both companies went out of business. All they care is ROI.
If you’re “second best” as a product then you need to position yourself as being better at something that the market leader isn’t doing as well.
Never trust Google with anything, if don't want it to be inexplicably and suddenly closed.
A few iterations of this, and you're down to a tiny but profitable product line. Now you're irrelevant to the larger market and someone with a bigger product line can knock you off by under-pricing their alternatives to your few products.
Stellantis, which owns Chrysler, Jeep, Fiat, and a bunch of other minor brands, did this. There is now only one Chrysler product, a mini-van.[1] Profits down. Stellantis cars sitting on dealer lots for more than a year. Angry letter to CEO signed by most dealers. CEO fired.