Hmm... obviously I only have the information in the article to go off, but on the face of it he doesn't have a leg to stand on. A deal was made which was agreeable to both parties. Why does he think he can renegotiate the deal now?I expect the reason that Netflix wanted to make a TV series of it was largely due to the success of the game anyway - so he can't say he's not profited at all from the game (beyond the initial payment)!
As with any internet-connected device that watches or listens to your home, it's not out of the ordinary to be somewhat wary of a smart baby monitor. All Internet of Things (IoT) devices are potential soft spots for hackers to monitor you. Anything you network can possibly be compromised, and while you shouldn't be afraid of an epidemic of camera breaches, you should always weigh the convenience of these devices against the risk of someone getting control of the feed.