[geofft]

The post isn't totally clear, so I can understand how people are misreading this. But "prevents blocked users from ... forking repositories" refers to the GitHub "fork" button, not to the ability to e.g. run `git clone` from the command line.

This isn't about blocking people from being able to use software (which both goes against the letter and the spirit of free software licenses); it's about blocking people from being able to interact with the maintainers. We've had that since the days of Usenet killfiles and IRC klines.