>>taubek+(OP)
The same applies to corporate networks - there is no good reason why the default office computer installations for your employees should have a browser without an ad blocker, there are some (not huge, but some) security benefits that make it a reasonable IT policy almost everywhere.
>>Peteri+nJ
In the case of the FBI, et. al., who according to the article "are already reportedly using network-based ad-blocking technologies", I'd wonder if not being able to access certain material would hinder the investigation of scams.