Not really? APTs would seem to be either criminal enterprises or state-sponsored because SOMEBODY has to be paying the big bucks.

So yes, probably 100% of criminal enterprises are paying off officials, but if that's the definition of "state sponsored" then the term loses any meaning.

EDIT I guess there's also "legit" businesses like Palantir/NSO group, but I would argue any firm like that is effectively state-sponsored as they are usually revolving doors with NSA-type agencies, the military etc.