I think it's worth noting that Uber has rarely gone down (I can't even remember one example, though I'm sure it's happened). While I'm absolutely sure some parts were downright horrifying at times (we've all been there), someone clearly had a good idea of how to make tradeoffs for development speed without compromising the core bits so much that they couldn't keep up with the rapidly increasing usage.

Huge difference between something like "The Ping" and deciding not to rewrite that original contractor code.