It is buried in the footnotes of the post, but the ultimate reason behind going closed source is that Google built their enterprise GDrive syncing client for mac off a fork of osxfuse. The original author of osxfuse feels entitled to some compensation for that and is doing his damnedest to make it happen.
I'm not sure if the dev feels entitled for _compensation_ per se, but G and other companies don't contribute back to the project in any form. Not $ and not in code. Now that is not a very good thing... though technically that's exactly what you get with permissive O/S licenses. It looks like the dev realized that and changed the license. It also doesn't look like he trusts this companies much, because otherwise he co…
If he doesn't have a copyright assignment, he probably can't easily change the license.
However, if the license is BSD, he can just not release source code. And, if he wasn't getting any contributions anyway then he gets no loss.