Here's the fundamental problem -- too many people on the internet are VERY lax or unconcerned about security. Take a look at this paper done in 2012 -- http://internetcensus2012.bitbucket.org/paper.html. The guy just used a search that checked for the default username and password and found 300,000+ open routers on the internet!! And, that is only of this one particular kind of router. I mean this is shocking that people don't even change their default password! So, imagine the more malicious person taking advantage of this, as well as attacking other computers as well with malware and such. That person could easily have control of several millions of computers. Now, he just has to ask each of the millions of computers to send garbage data to clog up the xbox or psn servers, so you can see how this can be very difficult to protect against. Remember, this will be a malicious attack, so each of the millions of computers is now sending a million times more data (or at least several hundred thousands...) to the xbox/psn servers. The servers suddenly see a load of several million million times more than they normally see. Of course they will become overloaded. The main fault is in all of us, being too lazy or forgetful, leaving our computers and routers open to all these script kiddies.