The problem here is that you can easily detect leaks to the press. Tainted information gets published and you know who leaked by how the leak deviates from reality.

It's less so with leaks between companies. A company that deals this way will never allow the information it gathers to show up like that. Even analysts who will examine the leaked materials will have little (not so little in the case of Intel - they have like two competitors) information about the origins of what they are looking at.