They can't. All they can do is have people monitor uploaded files and make some effort at finding illegal files, taking them down and IP ban the user who uploaded them to make it harder for them to sign back up under a new name etc.
But since they have a pay service--who knows how much effort they'll put into it as they're making money off of pirates.....unlike a totally free service like Youtube that has little to lose by banning users, taking down files etc.
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