The fundamentaly new aspect of her revelation is the extent of FB awareness of the situation, that they have evidence that some previously tested minor modifica

The fundamentaly new aspect of her revelation is the extent of FB awareness of the situation, that they have evidence that some previously tested minor modifications to their algorithm could reduce public harm and disinformation, but choose not to do so as it would hurt their profit. As the company has obligations to its shareholders to increase profit whenever possible, it has a conflict of interest making it impossible for them to choose the best option for the public good. So it's really like auto makers not providing more than the minimal set of safety feature required by regulators. We know that the only way to reduce said harm is by realigning incentives which requires involving the legislator.