Not sure if it's targeted and not sure how long this will last but casting is free for now, using the Foxtel Go app.
An update this morning for iQ4 & iQ3 boxes didn't work for a number of customers. And on the back of this, Foxtel have enabled casting for its customers.
We’re currently experiencing a technical issue which is impacting some iQ3 and iQ4 customers services resulting in a black screen. While our engineers continue to work on resolving the issue as soon as possible, we’ll be enabling casting through Foxtel GO for all our impacted customers. We apologise for the inconvenience. For more information about how to cast to your TV click here.
Wait you have to pay to cast?? What the hell.