There isn’t a reason to run a section of your company if it costs you money.
It’s funny that you say this, because Google intentionally ran YouTube without making any profit from it for many years. The goal (which they succeeded in) was to starve out any competition and establish YouTube as the online video monopoly. Ever since establishing that monopoly, they’ve been squeezing more and more money out of the platform knowing that social inertia will work against any would-be competitors (everything is on YouTube, all of the content creators are on YouTube, all of the viewers are on YouTube, so how does someone convince enough people to move to another platform?).