DDO is as safe as any website. There is always a certain level of risk when using the Internet and talking or interacting with people online, but that is how it is in the real world as well. It comes down to how well your protect yourself and if you make sure not to give anything personal away.
For those of us who have been members for a while now, we've seen the trials and tribulations that DDO has gone through -but there is a highly organized leadership infrastructure and a community of active members who report and address problems as they arise. On this website, people are accountable for their actions -both good and bad- and that's what makes this such a good, viable, valuable and above all safe site.