Not as long a Dropbox doesn't offend the wrong people.
https://en.wikipedia.org/wiki/Little_Eichmanns
Not that I disagree with what Megaupload was, but "they paid me to help, and I didn't ask any questions" is about the worst excuse in the world.
edit: to be super-clear, if you're participating in Megaupload, you're participating in Megaupload. It isn't just the CEO who is taking a stand against copyright (or for private communication, or whatever), you are too. Also, you should be prepared that people generally aren't sympathetic to moral stances that are personally lucrative, especially at the expense of others. This is because people lie for money.
But there are lots of companies that break the law so blatantly that their employees cannot claim to be ignorant. For instance, if I were an employee of Uber, I would be very careful traveling and would take every opportunity to hide the identity of my employer, especially if I were going some place where Uber was particularly irreverent of the local laws when trying to enter the market.
That's scary. I'm supposed to police my employers actions? To some extent I can understand, but that puts a lot of IT people in awkward positions. Do Dropbox employees need to worry that infringing content is being taken down fast enough, lest the face prosecution?
I didn't follow Megaupload too closely, so I hope I'm blowing this out of proportion...