Earlier quoted context omitted.
Tracking users over HTTPS is a solved problem, so I doubt that'd be it. Something about "never attribute to malice that which can be adequately explained by incompetence"?
What do you mean by that? Is knowing the URL of a HTTPS request a solved problem?
If third party tracking (for malicious intent or otherwise) is the main reason behind the change, why not do it how everyone else does?
It stands to reason they just don't want to deal with SSL termination anymore, for whatever reason. Though, at least in my eyes, that's a solved problem too.