Libra has raised fears about the future of blockchain mainly because it goes against everything the community wants and believes in: decentralization.
Facebook could ultimately create a massive closed-loop revenue model from ads, digital marketplace, to payments. Do consumers want to bet on the status quo of existing monoliths?
https://elixxir.io/blog/is-libra-the-future-anyone-wants The Libra project is very dangerous because a lot of confidential information about at least a third of the world's population will be concentrated on Facebooks private structure. It is hardly worth admitting. Therefore, the fear of world states that have taken a sharp negative position against such a project is understandable. However, in this case, the state also worries about the preservation of prices for their ordinary currencies.