Libra may not be a threat to Bitcoin, because the dominant bitcoin has already mastered all market exchanges and cryptocurrencies.
But it could be a threat to the enormous amount of altcoins. Libra has also been known since now because it exists among Facebook.
if you pay attention to how Libra is developing now, then you will understand that the future of this project is not so sweet. perhaps this project will not even be able to realize itself. that is why bitcoin exists and Libra does not