See this thread:
https://www.mobileread.com/forums/sh...d.php?t=321530
When portable mp3 players took off several years ago I remember reading an article about how the makers of them were caught off guard when they were informed by Microsoft that they had to pay royalties or something because they were using the FAT/FAT32 filesystem. But that was before people started embedding Linux so I have no idea how that aspect plays out. If they are still paying royalties I'd guess that they'd have to pay higher royalties for NTFS, so they'd see no gain for supporting it.