First, this isn't the first investigation of a content sharing website in our history... place this individual event into the bigger picture of the media industry versus filesharing (Napster, Limewire, others). All of these are related in the sense that the folks who are going after them are all lobbied by the same douchebags in the media industry... Whereas the particular indictments may or may not have been in effect until after SOPA was being 'suggested,' it doesn't mean that the reason that it was being suggested wasn't because of the threat from sites like these, killing the industry... ironically an industry that got to the point it's at by doing the exact same thing.
Second, correct, it was never closed to being passed, because of the outrage that it was ever introduced to begin with being sonically bombarded upon congress. there were several supporters of the bill trying to gain more support, and without the public getting huffy about it, it may have even gone through, who knows... doesn't matter really, because it's not passed now.
I disagree with your third point in that your entire argument hinges on the fact that MegaUpload did more than simply committing internet crimes (money laundering etc)... at this point, there is still no law that covers the internet piracy issues that the bill means to address. You can go around and find other problems that they're causing, but you can't indict them simply for setting up a method for file sharing, and that's where SOPA is supposed to step in...
I'm not defending MegaUpload as far as what they're being indicted for. I'm merely pointing out someone else drawing a line between the service that they were planning to release and the media industry going into a panic, deciding that they need all sorts of protection from companies that sidestep the 'rules' put in place... when they were the ones who sidestepped rules in the first place to get where they are now. Whereas physically the bill doesn't relate to the actual indictments, the two issues are very very much so related. By posting the original link I was in no way articulating my approval of MegaUpload's business practices, but merely that there is a HUGE coincidence between the SOPA/PIPA/ACTA bills being voted on around the time that this happens... coincidence yes, related yes... intentional??? maybe or maybe not?