This is not new. There have been checks for private API usage for as long as I can remember – at least on iOS. It could be the case that there was less enforcem

This is not new. There have been checks for private API usage for as long as I can remember – at least on iOS. It could be the case that there was less enforcement on OSX. However, this is not really about unsigned binaries. These APIs are from OSX itself. This is about access to private APIs. These have no contract and can be changed at any time, as they were not intended for public consumption.