Because they are for-profit businesses and as such have a strong incentive to spend in ads and for these ads to be as effective as possible. FB and Google are j

Because they are for-profit businesses and as such have a strong incentive to spend in ads and for these ads to be as effective as possible. FB and Google are just giving them the means to do so; we should be asking why it is that hospitals are allowed to have these strong economic incentives to begin with.