A ghost afraid of a nightmare? Sorry, just struck me as funny Here's my understanding of the sit:

ESPN and what we normally think of their linear channels (though now available via streaming bundles through multiple access points) is now attempting to monetize content in this new era. Hence, the advent of ESPN+ with live content only available via subscription directly from ESPN. They are adding live content as rights become available as well as providing access to original shows and rebroadcasts of ESPN productions on demand.

Currently, they are two stand alone services, and as such, purchased independently of each other. However, if you wish to see all that ESPN has to offer (linear + digital), a sub. to both is required.