Apple does this with their developer videos as well. Very few videos from before WWDC2015 are available (some from 2014 are, but not all of theme). I think they

Apple does this with their developer videos as well. Very few videos from before WWDC2015 are available (some from 2014 are, but not all of theme). I think they might still be on the server if you have the right URL, but otherwise they are inaccessible. It’s a shame because a lot of the information is still valid, even if the example code is in Obj-C. For example Apple demoed how to implement very cool, very custom CollectionView and UIKit Dynamics behaviors in some of those older videos and now it’s just gone. Edit: And they no longer update their documentation archive. At least it’s still available, there are a lot of very in-depth programming guides in there with information that is still 100% valid but not available on the normal documentation website.