As a first and very pessimistic guess, the pages getting DoSed are maintained by people or groups with pretty minimal resources. That means time or money availa

As a first and very pessimistic guess, the pages getting DoSed are maintained by people or groups with pretty minimal resources. That means time or money available for lawyers isn't there, and the monetary impact per website is small enough that LE may not care. Also, they might share the common viewpoint of "it's the internet; suck it up."