You can't lower prices to below costs and make money. If they're not profitable now, to become profitable they need to either cut costs or raise prices.

The only reason to have prices below costs is to gain market share so you can do one or both of those later.

What costs do you think Uber has left to cut that they haven't at this point? Maybe workforce.

This is all a common well known business tactic, which many businesses have used in the past to establish market position. It's what they'll do with that market position people are worried about.