OpenSubtitles, one of the largest repositories of subtitle files on the internet, has been hacked. Founded in 2006, the site was reportedly hacked in August 2021 with the attacker obtaining the personal data of nearly seven million subscribers including email and IP addresses, usernames and passwords. The site alerted users yesterday after the hacker leaked the database online.
I think I did answered your question why they are being targeted. OSub logs specific data, like most platforms to avoid fraud, spam etc.