Which is just lazy, terrible marketing. If you don't own the most obvious domain, do not use it as the name of your product.
If I go to joojoo.com and don't find what I'm looking for, there's not a chance in hell I'm going to start iterating through other possibilities. I'm either going to hit up Google or give up.
You're missing the fact that most people use Google as their 'location bar' and not the actual location bar. People literally do a Google search on Yahoo.com to get to Yahoo's site.
That was a great recovery for dropbox - but note that at the end of the day they still needed dropbox.com. This isn't to say that you can't succeed despite a crappy domain name, but rather that when you haven't even locked down your brand yet, why commit to something that you can't secure the domain for?