https://news.ycombinator.com/item?id=44606646
But if you dig hard enough, there's actually links to more evidence of why it is that complicated... so I don't think it was necessarily intentionally done as a method of lock-in, but where's the outrage in that? /s
"Complicated file format has legitimate reasons for being complicated" just doesn't have the same ring to it as a sensationalized accusation with no proof.