While I'm sure personalization increases ad efficiency metrics to some degree, I'm curious to see how all this will actually "hurt" FB, either by making their a

While I'm sure personalization increases ad efficiency metrics to some degree, I'm curious to see how all this will actually "hurt" FB, either by making their ads worse in terms of CPA/CPC/etc or in advertisers pouring less money into FB and more money into other DSPs/inventories. As anything marketing, it's not that straightforward, really, and advertisers may very well keep running ads on FB despite all those changes.