He failed to cover up traces of the unauthorized access and admitted his guilt six months past the incident.
The court sentenced the violator to probation and fine.
Breached Adult Friend Finder database includes more than 412 million records about users. This is the most large-scale incident, at least since 2016 beginning.
The attack in 2013 threatened data of more than 500 thousand users. The authorities accused the company of improper protection of information.
The leaked database contains information about 550 thousand users who filled out the questionnaire on the organization web-site from 2010 to 2016.
More US companies are preparing a data breach response plan but management often doubt its efficiency.
According to the Breach Level Index database, in six months 974 leakages occurred worldwide. In 29 of them, over one million data records were leaked.