Matt, if in TGN's view you are not "under contract", you are free to take you skills elsewhere. It appears you have entered into a valid contract with TGN. I don't see any relevance to TGN's parent company, although I haven't read your contract. Your site is the best out there, and I can see how much hard work you put into it. Maybe it is time for you to play hardball if you feel you are being taken advantage of and host a site elsewhere.
Larry