In February 2015, the FBI took control of Playpen, the largest dark web child pornography site at the time. But instead of shutting the site down, the agency kept it going for just under two weeks, in order to deliver malware to its visitors in the hope of identifying suspects in its investigation.

Newly filed court exhibits now suggest that the site performed substantially better while under the FBI‘s control, with users commenting on the improvements. The defense for the man accused of being the original administrator of Playpen claims that these improvements led to the site becoming even more popular.