The forum I own was a result of a VS takeover. A site with a strong community dating all the way back to the late 90s got sold by the original owner very suddenly. Basically, we all found out after the deal was done. Community was pretty shocked to say the least.
Literally that morning, three of us who had been very active forum members for many years took action and set up a new forum and started a PM chain that snowballed. We had essentially alerted nearly ALL the active members within a day and had a seamless transition to a new forum which is still going strong a few years later. If anything, we're doing better now than the years leading up to the VS sell out.
Maybe not the most ethical thing on our part, but neither is what happened to the original forum. It's very media and creative content-heavy, and all of that became property of VS with no heads up. People were extremely unhappy. Many of which went back and manually removed all the content they'd contributed over the years. Needless to say, the forum VS purchased is very, very dead now.