One of the best uses of GitHub is being able to search for some obscure framework method name or enum constant, and find examples of working code that uses it. This has saved my life many times when trying to figure out how to configure Java frameworks to interact with each other.

When searching for this kind of code, you have to wade through an awful lot of repos containing half-baked personal projects, experiments, unmodified clones of upstream frameworks, and barely-modified boilerplate examples. It would be nice if there was less of this detritus clogging up the search results.

However, sometimes the code you actually want is embedded in some otherwise useless, half-baked personal project, or barely-modified boilerplate example. So if all these projects disappear behind a veil of privacy, maybe it won't be a net win.