It was a 17 year old kid from India; naive and foolish but I don't think it was malicious. His post says the audio books were an idea to try and pay for the high bandwidth usage - 120k users in 24 hours, serving over a terabyte of data.
I think he probably had good intentions, but clearly this was a bad idea and of course to many people it looked like someone was trying to commercially exploit the work of many thousands of fanfic authors, plus feeding in to the AI slop fest.