Well figure it out, if someone hacked there servers/sites, what makes you think they won't do it again? They pissed off some people, that's what you get for hosting warez/hacking/kiddie pr0n sites, you piss a lot of people off, and I don't care if you are the best security professional in the world, you can't secure anything 100%, It isn't possible.
If you stick with this company your just asking for trouble.
Use a little the common sense, if that 0-day exists many hosting sites will be hacked, not only servedome.I honestly believe Solus lied to us saying that this wasn't a 0-day exploit.