Theft isn’t specific to property, you can steal services too.
You can’t really “steal” services, even though they sometimes call it that. You can access services without authorization, but you’re not stealing anything. You can access services you don’t have authorization to access and then disrupt people who are authorized to use those services. But, again, not stealing. Just disruption.
Stealing deprives a person of something, copyright infringement and unauthorized access to services don’t.