It's crazy because the competition is pretty much 100% internal and at some point, internal competition of anything will lead to systemic destruction of something critical if there is no authority figure demanding internal combat needs to stop.
And let's face it, a company like Uber or Airbnb will never tell its participants that they can't drive more often or share more rooms because that will limit their product offering. Also, the government won't, can't, and shouldn't interfere either.
It will solely rely for the workers of these sites to form unions agreeing upon their own quality standards and reflective pricing and will act as a group against the interests of the corporation they are inherently the product for... But pardon me for my cynicism, we're not at the point yet were self-preservation supersedes the desire for just a fractionally larger income.