Dear @honarparvar
let say that right now crypto has the prerogative to be the hide economy, so we can have 10 BTC but none know that, but you could imagine the same with this Libra? Of course not, Facebook from when is born have the only target to know what we do in our life, this will be the last stage to connect crypto with identity, so all your friends will know that you changed BTC into Libra, but not only your friends... Thinking about it....
you are right but not everything is about anonymity. I'm not a fan of FB, but still there good things about it...