Who パーフェクトダーク here? Because keeping 25GB of other peoples' files on your computer is worth it.
It was shitty software, closed sauce, and windows only. Absolutely disgusting.
I do not have any problems contributing to the pools and bandwidth of bittorrent and other p2p protocols, freenet, tor, i2p, whatever.
But not the horrors that are Share or Perfect Dark.
Some proprietary file sharing client with proprietary protocol that the Japanese sometimes use.
Virtually nobody but the Japanese uses it, and as far as I know there's exactly this one shoddy piece of software and no others that can access the network.