The allegation that driver payouts are manipulated to:
1) Hook new drivers with better than average rates before tapering off 2) Take into account the age/model/value of the vehicle and what payments for it would look like in the market and dole out enough to cover costs but not "too much" that they're getting ahead of other drivers
Totally baseless and sourceless hearsay tho. Still, if true, really plays into the image of "there's no depth they won't go".
Add another: the various platforms talk to each other (or analyze driver movement) in order to manipulate order offerings in such a way as to discourage drivers from taking orders from more than one app at once. One app will wait until the other has confirmed an accepted order before deluging you with their own orders, all taking you in the opposite direction (which makes you late for one or more deliveries, giving cause to terminate your contract).