Saying that if they're not working on self-driving cars, then they must think self-driving cars aren't worth pursing is a non-sequitur. Every Uber I've been in has had music playing, why don't they buy some satellites and build a SiriusXM competitor?

Uber isn't even profitable with their core business of being a not-quite-taxi company. They quite obviously don't have the money to build their own self-driving cars, too.