You have to be patient with progress on this one. More and more are appearing in Europe from F- feeders. At YBBN the local F- feeder can only see them at the southern end of the field. I suspect the same issue at YSSY where a nearby F- feeder can only receive messages for part of the entire airfield. You have to be lucky to see one. If they release a version for T- feeders (eg Rpi) you will get a heap more.