The possible cause for this maintenance, according to Kotaku, may be because of the glitch which allowed players to get the $20 DLC: The Old Hunters for free. This speculation comes from a thread on subreddit titled “Old Hunter free DLC glitch.” The post has now been removed, but certain users claim that the steps actually allowed access to the DLC for free.
We apologize for the inconvenience, and thank you for playing Bloodborne."
- reads the official page.
A post on Reddit by lead hosting engineer, Tim Wernicke, also somewhat hints towards the above speculation. In the post, he stated the reason for the emergency maintenance is to fix a big DLC exploit and some other serious issues. Getting a $20 DLC for free is a huge exploit if you ask me. Here’s a screenshot of the comment.
The Old Hunters is so far the only DLC available for the PS4 game since its release in March this year. The DLC was released last week.