Because what you said is nonsense. They are capturing a fraction of the value they created with the invention of app-based ridesharing. They are not dipping into some magical pool of "exploitation" to juice that. Anyone that is unhappy with being an Uber driver can literally do anything else. Nobody is forcing them, there is no exploitation.

Absolute horseshit.

They maintain an app and some servers and do some cursory checks on drivers. Those things are pretty easy to do.

In a properly competitive market for ridesharing apps those things would be commoditized to the point that they are pennies per ride.

The vast, vast majority of the value is getting you from A to B whether you are in denial about that or not.