Customer acquisition in ride sharing space is a fairly well-trodden path - start with a high promotional credit for signups/referrals, gradually lower those as desired metrics are met.
I guess in that sense an acquisition makes sense when the target is priced below the cost of customer acquisition, but I doubt that is the valuation Lyft/Uber are hoping for.
Google even promotes this by having the ride hailing part of maps.
The scooter business amplifies this even further, very few users or charges have a strong preference to a single brand.
While YouTube had advantage in content, Vimeo had targeted commercial content, but very low stickiness.
Google might have smart engineers, but their user experience leaves a ton to be desired IMO.
I'm no expert, I just see this narrative parroted all the time.