

Not neccessarily. A spun off YouTube would still have YouTube premium and ad revenue. They could also sell user data to 3rd parties (I doubt Google currently does it on a large since it’s in their interest to have a better ad network than its competitiors). A move similar to Reddit’s with their API and exclusive search agreement or agreements to feed certain videos to AI would both fetch a higher price and upset the quality less since the vast majorty of videos watched are found through YouTube itself.
Short answer: the bank won’t give your shiny new tree-planting business a loan as easily as it will to a “liquid tank tree replacement” one.
Long answer:
While algae are more efficient at turning CO2 into oxygen in theory, in practice algae don’t have a good climate in such a tank (no oxygen without ventilation, i.e. constant electricity and they get cooked through the glass).
All in all, more of a gimmick than anything.