Actually your question has been answered in one of the news sources about Libra vs Bitcoin.
The answer to your question is exactly as below.Libra is a digital money that resembles Bitcoin. The difference is, Libra is managed by a non-profit organization called the Libra Association which is based in Geneva, Switzerland. In addition, Libra uses guarantor assets in the form of government bonds to banking deposits, while Bitcoin uses Blockchain technology as its guarantor asset.
Libra is a controversial digital currency because it has been rejected by many central banks. Libra's original idea was to make sending money between countries (remittances) as easy as chatting.
The problem is, Libra money is not controlled by the world's central banks because it is not the official currency issued by a country and central bank.
If Libra is in trouble it can have a systemic impact on the global financial system. If there is a problem, the central bank cannot take rescue action because it is not guaranteed by the state and central bank.
The conclusion: No impact at all, because:
while Bitcoin uses Blockchain technology as its guarantor asset.
If Libra doesn't thrive in the market it will have an impact on themselves,
not Bitcoin or cryptocurrency.