Assuming an estimated ROAS of about 6-10x then this equates to advertisers seeing a $60B to $100B reduction in sales via Facebook. Many of these advertises will not be moving this budget elsewhere, they will just be seeing reduced sales.
So, I'm all for criticism of online advertising ethics, particularly targeted at Facebook. But please remember they are an important part of the larger online economy which supports business that employ people. Please remember the people at the bottom of the chain here who have (and will continue to) seen a material impact on their business, income or employment due to these (and the inevitable further) changes.