I wish people would seriously consider (A)GPL for their projects more often. It hasn't happened here, though has certainly happened in the past without anyone knowing - (A)GPL would make it hard for them to make a closed source "fork".

In fact, I wish an even stronger license existed which allowed the original author to dictate who can build on top of the project to avoid exactly these kinds of situations where a powerful actor completely disempowers the authors while technically following the license (I assume MS will "fix" their error by fixing the licensing information but will continue to compete with Spegel with the intent to make it irrelevant).