Looking at that Dreamhost thread, it does sound more like the host was hacked and not individual clients.
Almost all of my sites on Dreamhost have been attacked. Not just my own personal sites, but also client sites I have set up on separate accounts. This has never really happened before, which is why I've been a customer for so long. It's curious that this coincides with their massive security breach. I contacted them and 7 days later I was told it was my fault and they are not responsible for my files. In any case I trusted them to safe guard my passwords and in that regard they obviously failed.
This kind of thing happens, unfortunately. What is most bothersome is that Dreamhost seems to be blaming the clients. If Dreamhost is to blame, and it appears that they are, they should "man up" and admit it and formulate a plan to prevent anything like that from happening again in the future.
When I submitted my trouble ticket to DreamHost, I got back the form letter some of you also got, basically blaming the trouble on me, saying security was solely my responsibility, but that I could try, with no guarantees, restoring from DreamHost backups (if they have them).
It's too bad there is no real ability to blanket ban all traffic from countries like Russia and its former satellites and China. That's where most of the hacking comes from.