I wonder when Moz was SEOMoz, did they go after SEODoz too? I don't know much about SEO, so I don't know similar they are. But if Moz as SEOMoz didn't pursue similar action against SEODoz, I don't believe they should be doing same as Moz with Doz.

The unfortunate situation is that due to small size of Doz, the cost of litigation will be prohibitive for Doz otherwise SEOMoz vs SEODoz will be a good point in litigation.

What disappoints me most is a companies that as a startup expect to be treated nicely by larger ones, start to behave similar to larger one when they become large themselves.