It was sold three times. AG bought it from CNET -- the founders had nothing to do with that.
Founders buying back companies for pennies on the dollar is surprisingly common. There's a 300-ish person consultancy in Cleveland with such a history . The founder cashed out twice.
Its got mostly to do with their closed platform. However, recently they have started opening up things (i.e. their codecs). Skype has established a phenomenal brand image that is under-utilized right now because its still chained to the computer. Nonetheless, Developments like the iphone app are a breath of fresh air and shows their strategy of truly mobilizing the app.