it's a bit insulting to credit libra with sparking bitcoin's bull run.

the whole circular logic of "NEWS STORY MOVES MARKET" is such self-serving nonsense. They're supposed to be following events, not guiding them.
Here's the real newsflash: people best placed to manipulate the markets also try to manipulate newsmedia headlines. I mean duhhhhh
if there's really,
really some news that will move markets, there is a massive incentive to make sure your journalist friends DO NOT publish the story until all the cronies have made as much money as possible from the news
before the peasant class get to hear about it.
then there's the "throw them some table scraps" type stuff, where e.g. some very recognizable company like Netflix or Facebook get hyped in the press ahead of their IPO, and still has no discernible profits and nothing but borrowing to invest as a business plan. Investors see returns in the medium term, but who knows what will become of these companies in future; near-zero or questionably valued assets, and no income.
and then there's the clearcut BS and schizophrenia we get in cryptocurrency land, where outright BS stories get published, or the same self-contradictory story is reported 20 times ("CHINA BANS BITCOIN, THIS TIME FOR REAL!"), all aided by lack of any real information, not to mention investor ignorance in a nascent and very technical, yet profitable, field.
Tales of market manipulation have a long, long history. There is no reason why it should be any different today, and the manipulation is more sophisticated than ever.