There are hundreds of billions of dollars being invested by naive people. I really hate this idea that they are all appropriate victims for dishonest companies. In the absence of appropriate means for punishing them directly (where are you, Anonymous?!?!), we have to use the current legal tools available to us. Otherwise, the rip-offs will just grow and spread.
I don't see how can you prove those "dishonest companies" guilty. And if you can't you won't really have a case.
Those naive people most probable clicked into phishing sites and gave their credentials to malicious third party.
I don't say that the businesses are not necessarily guilty, but why would they risk stealing if they do earn money anyway? Again, you only have a case only if you can prove them guilty.