Assumption: targeted advertising is more lucrative than indiscriminate advertising. (I'm not sure this is true, but it seems to be accepted common wisdom.)
If I were to run FB or Google, and discovered ads of any type were being blocked, I'd naturally try to change the minds of my users the old-fashioned way: money.
The problem is the entire "free through advertising" model. Once you set the price of something as "free" (ala Gmail/Google search) you have a tremendously hard time charging people for it. Sure you can provide "premium" features (ala the freemium model) but how can you do that with search?
If I were to run FB or Google, and discovered ads of any type were being blocked, I'd naturally try to change the minds of my users the old-fashioned way: money.
The problem is the entire "free through advertising" model. Once you set the price of something as "free" (ala Gmail/Google search) you have a tremendously hard time charging people for it. Sure you can provide "premium" features (ala the freemium model) but how can you do that with search?