D&S researcher Alex Rosenblat wrote a blog post discussing how Uber can implement wage withholding policies without driver input or negotiation.

This set up essentially provides negative disincentives to drivers to retrieve the wages they’re owed. An analogy I think of, by comparison, is how cell phone companies can cram small fees into customer bills. Only some percentage of customers are actively tracking their bills, and some percentage of those are willing to spend an hour on the phone with a well-meaning but ineffective customer service agent to get back their small fee.