It's a cheaper option, to allow your uber to "carpool", I.E. Your uber can pick up other passengers heading in the same direction to be more efficient, thus justifying your discount.
You can see why it'd be a jerk move to then get mad at the other passengers, who had no idea who they'd be pooling with, and how insane it would be to use it on the way to your wedding.
Eh, kinda how the dictionary needs to work. It's meant to be used to understand the language, so the dictionary can't hold strong opinions and argue against how it's used and remain useful.
I.E. Let's say English is my second language, and I read something like "OMG I would literally kill myself." And I go look up "literally" I'm a dictionary. If the very common antonym usage of it isn't listed as a second definition, I'll totally misunderstand.
So as much as we may not love that a word is flipping to mean its opposite, it is what it is and it's not the role of the dictionary to take up that fight.