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My guess is that porn downloaders, like may other media downloaders (warez, music, videos, etc.), have a hoarding/pack-rat mentality. All too often I see people amassing various collections of digital media so huge, they'd never in a lifetime be able to consume it all.

The same issue as with most services: you can't be certain it'll be accessible tomorrow. Maintaining a local archive of your data is always a good idea.

Most porn is quite distasteful, and streaming sites' tags are generally a mess (if they are even implemented).