Earn-outs are difficult, my arse
"Earn-outs are inherently difficult creatures, but we are happy with the result of this one" = 'There's no way we were going to get more money if we carried on, so let's cut and run whilst the going is good'.
Not that I can blame them, of course - wouldn't you grab the cash too?
Still, Joost is probably even worse than Skype, and is only propped up for the same reason Skype survived - it's free.
If Skype wasn't free/very low cost its bloated unreliable software, lackluster interface, crap design and lack of interoperability would have terminated it at birth.
Joost isn't in the running, and is absolutely crushed by stuff such as 4oD, even with the sneaky peer to peer that contains.