the social cost that ensue from the use by everyone of sth.t

the social cost that ensue from the use（ by everyone） of sth. that would be fairly harmless if ,say, only the rich were to use it.
by everyone作the use的定语.by everyone不要放到of sth.后面的好,因为后面的定语从句引导词that应该紧跟在它修饰的成分the use后面.要是把by everyone放在that前面的话,句子意思就变了：成everyone对...无害了.