According to the person who is actually leaking this pictures to popular forums, he acquired many of the pictures either by trading or buying them from the -rea

According to the person who is actually leaking this pictures to popular forums, he acquired many of the pictures either by trading or buying them from the -real- hackers on one of those shady online marketplaces. He claims the hackers got them from iCloud hacks, and other more social engineering hacks.