In a reply from an Microsoft employee who's familiar with the situation, some group in Azure wanted support for some Azure-specific APIs. The spegel dev decided that was too far out of their wheelhouse, so they didn't want to add support in spegel for that Azure-specific API. The Azure subteam went ahead and added that support into their fork of spegel.
Other changes removed the spegel project's LICENSE and added in Microsoft's LICENCE file and copyrights on all files.
see https://news.ycombinator.com/item?id=43755745
