I guess this is your choice but I find it unethical. If you're a good engineer at Uber chances are 100% you can get a job at any other high-paying organization, so why choose to participate in this scheme?
As for the core of your point, frankly, half of the Silicon Valley would be jobless. Not just Uber programmers who already proved who they are by developing Greyball. The whole business of Facebook and Google is centered around tracking people. Amazon will happily accept fake reviews and products as long as customers pay they're happy. Netflix officially says they're competing with the time their customers use for sleeping. Apple will do everything to make their products environment unfriendly, unupgradeable, with ton of additional accessories produced only to increase their profit. So really, I understand your idealism, but the ship has already sailed and you can call yourself lucky if you can work on a product and for a company that are 100% ethical.
However, in this case, things are quite black and white. Someone pays money for food, they don't get any and then you keep the money anyway. Calling it anything other than theft is being delusional. If they did partial refunds or they only gave uber eats credit instead of money then this case would be in the same bucket as the ones you mentioned in your comment.