Facebook's Crypto World Domination - The Libra (DTube)

Facebook is planning on launching its own cryptocurrency called Libra.

For a long time, people in the Bitcoin community have hoped that it could reach mass adoption, that everyone would start using it and abandon fiat currency. That hasn't happened yet.

Is it possible that a multinational corporation like Facebook could take this technology and use their existing user base to introduce it in a way that's user friendly, and dominate the whole market? And if they do, what's the worst that could happen?