1. The absence of tipping is a feature. Uber was originally a premium service. Many premium services explicitly discourage tipping.<p>2. Driver ratings replace the primary function of tipping, which is to incentivize good service and leave feedback.<p>That said, I very occasionally leave a tip in extraordinary circumstances, and would not be opposed to a way to do that in-app, as long as it was very clear it&#x27;s not expected (hide behind 5-star rating, call it a &quot;bonus&quot; or something).