The money comes from a failed auction where the hackers tried to get people interested in the files they had. Since people didn't really show that much interest in the documents, the group eventually dumped everything online for free.
While that original auction may not have drawn too much attention, it's almost certain that the subscription service they've just announced, where people need to pay north of $21,000 in exchange for one monthly leak, will get a lot more fans.
It is believed, therefore, that the Shadow Brokers managed to steal a lot more NSA files than they led people ...
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