@jalefkowit I remember things slightly differently. I remember Movable Type had a search function, that, when abused (and this was trivial, anybody could, and did, write one-liners to exploit this), would sponge all resources on a server until bringing it down. I also remember hosting companies banning Movable Type on shared hosting and VPS environments, forcing MT users to either 1) switch to something else, or 2) fork out for big iron to save everyone else from you.
@jalefkowit So, the licensing might have been a component. But for the overwhelming majority of Movable Type users, I get the impression moving away from MT was less a move to something with a better license, but more of a *severe* tech debt that exploded so badly hosting companies were willing to tell people their money wasn't good anymore, and WordPress happened to be "Well, shit, the site's down and I gotta change it or stay down...fuckit, Wordpress exists, right? Can't be worse."