You can buy the rights to these photos, just like you can buy animal sex content - from producers, owners, ect. I'm pretty sure someone sells this as some package, like a turnkey system, and the real owner retains the web rights.
Pretty common stuff.
And the free porn bitch, isn't new.. The day the first porn picture came online a Pornographer making money complained about it being the end of times.
Free Porn Does Not Cost You Money - Free Porn Makes Money
Wake up from your lala land people...