The first commercial version of the YouTube app (1.0) was included with Android 1.0 on the HTC Dream in 2008.
Developing a post about the YouTube 1.0 APK can be approached from two angles: as a piece of digital history (the original 2010 app) or as a technical "Hello World" project for Android development. Option 1: Historical Deep Dive (Nostalgia) youtube 1.0 apk