My two pence.
To be honest I have no objection with Viz trying to protect their license but Mangastream were the wrong target which is what angers me. They explictiy made a point of not archiving manga and actively encouraged people to buy the volumes when they were released - all to support Viz. Had they gone after the sites that archive huge collections then I would have no issue but Mangastream does not do that; it provided a service for non Japanese fans to keep up to date with the latest events in their favourite manga.
Furthemore they've basically denied the rest of the world from reading manga now, as there is no legal alternative to them. What they fail to realise is that at least half of the non Japanese manga fans reside outside of North America, in places like Europe, Oceania, Asia and South America. Before jumping the gun they could have negoitiated with Japan to secure the rights to publish WSA in all non Japan locations thus providing a legal tool (which I would be glad to use) for us to follow our favourite manga. Currently Viz has just stranded millions of fans around the world.