Libel and defamation lawsuits are tricky because one would need to prove that Bloomberg ran the story knowing it was false or ran the story with "reckless disregard" for the factual accuracy of the reporting and prove that the article resulted in damage to the plaintiff.

Many dubious articles go unchallenged because it's often not worth pursuing legal action.

It's not like these companies don't have the money or legal resources to do it though.