system
A chat on subreddit /r/wallstreetbets
human
Readable format != Plaintext though. 
  
 &amp;#x200B; 
  
 It could be a proprietary binary blob that they were storing it, but instead found it encoded in hex strings? 
  
 &amp;#x200B; 
  
 This is not a data leak, just a security audit found a portion of data wasn't using the proprietary system.

gpt
Moronic distinction