Almost every driver I ride with is switching between the Lyft and Uber apps to see which one is offering better rates/destinations. The incentives appear to be insufficient to offset rate disparity in this market - unclear if that holds true everywhere.

I'm not at all well-versed in statistics, but it seems that without enough extra cash to consistently one-up the competition in terms of incentive structures, a ride share company could not make the driver's choice of which app to use a non-random event. So yes, a driver wouldn't necessarily choose all four at once, but they also wouldn't consistently pick one.

It's a well known fact that the biggest factor in taxi revenues is how much paid miles/km you can do per day. The single biggest factor to increase your revenues is increasing that number.

So unless the incentives are massive, a driver will always look for the next ride by any means necessary. It's nearly never worth it to "wait for a better option".