As appealing as 3.6M users sounds, "reach" apps like this often make really bad money. He would've made no more than $500 if he was doing well. He was capturing emails, so that had long term potential, but he wouldn't have become rich from three days of FB user impressions.
it was only a weekend project, only running for a few days before takedown - under those circumstances I'd call $500 a solid outcome, especially when the alternative is $0.
