This seems like a confirmation popup, according to the reduced brightness. While the cancel button is still visible, you won't be able to tap it and even if you could, it won't work because the account actually got deleted after selecting "Delete Account". And of course also because you're going to be logged out, as the message says. I have never used Uber, let alone deleted an account there, so I may be wrong, but I'm fairly certain that the account actually got deleted at that point, if my assumptions are correct.