It's funny there's this idea that a company _might_ be potentially injured over code they do not want or know they had being made open source by its actual author, even though many of those companies will gladly use open-source tooling without ever contributing anything back.
Perhaps more soundly, though, in California – where Uber is headquartered – IP/Copyright for code is a huge legal question that the state and federal Supreme Court has no clear answer to. Sure, you obviously can't secretly clone Uber's entire stack, slap a new company logo on it, and start up as a competitor. But if you, as an author, wrote some code for a company under an IP agreement, then no-longer worked at said company, and then later adapted and expanded upon that code (or even started over, with the knowledge of what you learned from others' work): are you, at the originator, not legally allowed to be inspired by your past work? That's not something you, me, or even the company could decide.