The major studios use cloud services all the time. For example, Paramount uses AWS. Disney has its own internal cloud system but also uses a combination of external clouds like AWS.

The resistance to cloud services is based on preventing leaks, not opposition to technology.

And in specific response to your comment: Netflix's "technology" is just a content management system. They're just reinventing a wheel that many of their competitors already use and bragging about something that Disney, Paramount, etc., did over a decade ago when they began embracing digital-first production.