To run it, you need thousands of permissions, I do not think that even such a company will do it easily and quickly. In addition, I bypass her at all, it is not confidential, it is not safe, and I agree that such things are being done to capture most of the people under their control. Mark Zuckerberg with his support for gays, and most of his ideas are simply one of those who are at the helm and killing society.
I also think that this is only the first application for such a large technological progress. It seems to me that even to Ethereum it will be very difficult to do.
As long as we have the regulators to oversee the facebook or Libra, things will be safe for us.
We have submitted already with them when we use the facebook and we are with the terms of the company, so with Libra, it's not new as we know we can trust them and we know how strong the regulation is in their jurisdiction.