Libra hasn't launched yet, just so you know.

As to whether I would own or use libra the answer is 'no'.  Since facebook's practices disgust me, I wouldn't have anything to do with whatever they have planned for their cryptocurrency, and it's a stable coin anyway.  I have never had the need to own tether or any of the others, so why would I own libra?

I think discussions like this are kind of moot, because I doubt the U.S. gov't is going to allow facebook to proceed on this and let libra launch.  I'm very curious to see how it all plays out but I wouldn't keep my hopes up if you're looking forward to it.