Not only that, they would also announce it. Imagine that there is a restaurant that you own, is very popular and has a high trust in people. Why would you sell it in complete silence? Even if you sell it that way, when the new owner ruined the whole restaurant and people get sick every time they eat there, when the whole society thinks you are still the owner and everyone blames you, won't you publicly state that the restaurant changed the owner and that's the reason why everyone's getting sick? Because the same people no longer manage it.

That's why I believe that Freebitco hasn't changed owners and there are other reasons behind the scenes about its failure. Probably owners got caught and they are in jail or they have serious health issues, probably ended up in a car crash or something like that. There are no other logical explanations.