Called it in February and I'm going to be insufferable about it for exactly one post.
Owner-operator versus reseller. Your three nothing-never providers own their racks. Your two forwarders don't own the racks in the jurisdiction they're forwarding from — they're on somebody else's floor and that somebody else has a compliance department. Nine months of data and the split falls exactly along that line.
Not that anyone will use it. Next week there'll be another thread asking which host is bulletproof, and the first reply will be a list.