I believe these companies (Uber, Lyft, etc.) coined the term ‘rideshare’ primarily to skirt the taxi laws.

You see, they aren’t technically running an unlicensed taxi business - no, no, no. When you use their app to say ‘hey, I wish to go to the icecream shop on third’, it lets all the other people with the app (and a car) know. If any of them happen to also be going to the icecream shop on third, they can let you know and the two of you can connect to share a ride there - isn’t that nice!

These are in no way unlicensed taxis… That would be highly illegal and totally unfair to other taxi businesses that have to spend ungodly amounts of money to license their vehicles. It’s just you and a stranger sharing a ride to go get some icecream…

That’s the wonderful thing about a living language, if enough people start using a new word or a variation on the spelling of an existing one, it can simply become correct at a point.

The compound variant ‘usecase’ is often used in tech and refers to a very specific means in which a system is utilized.