Did you really think investors were willing to sustain a 12 billion dollar loss for a shot at a 1% margin?
Citation needed. They've raised prices in order to be sustainable, but you're going to need to show some kind of actual evidence of collusion. Extraordinary claims require extraordinary evidence. We can't just assume conspiracy theories between publicly traded companies here.
And who's talking about 1% margins? You're making that up. Healthy competition usually results in something like 10% margins. You don't need illegal agreements to get that.
I tend to assume the path of least resistance.
Still, Uber is not sticky. Drivers aren't forced to use it exclusively (fun things would happen if they tried to pull it off, something something employees). Brokerage websites most likely will demand you don't post your apartment on multiple sites. This will encourage concentration.
Kind of like people looking for used textbooks will check eBay, Alibris, and Chegg.
Of course there will be concentration, that doesn't mean it's going to be a monopoly. It's just going to be the usual 2 main competing companies with a 3rd slightly-different company -- your Coke, Pepsi and RC, or your AT&T, Verizon and T-Mobile. It's the usual market pattern.
