Second, it's actually quite possible Dropbox asked the .com holders to forward traffic to the real site in order for both parties to value the domain's contribution to downloads/upsales from type-in traffic (is it 90% new users? Or almost always those who have an account?). This would mean TechCrunch hurts Dropbox by increasing their cost to buy/license the domain.
Third, we can't tell who owns the domain, so it could still be the same party! The .com could forward to the real site for just one day to tease Dropbox by sending it visitors for just one day. This also means they could point to the real site for a month, then a competitor later on after links start rolling in.
Finally, I don't think this owner, nor Justintv.com, are cybersquatters since they owned their domains since the 90's.