I would have assumed that the changes make it too impractical to maintain.
Semi-related but the game Vindictus/Mabinogi Heroes (a Source engine MMO) changed the game archive format multiple times (and probably continues to change it every so often) because people would eventually reverse-engineer the format, dump the files, then use them in Garry's Mod or the like.
Semi-related but the game Vindictus/Mabinogi Heroes (a Source engine MMO) changed the game archive format multiple times (and probably continues to change it every so often) because people would eventually reverse-engineer the format, dump the files, then use them in Garry's Mod or the like.