Well the issue was that was a closed file system owned by Microsoft and used on Linux for Flash Drives and SD Cards.

If you sue closed technology you get burned. I didn't have a problem with Microsoft doing what they did. We should have used an open file system for those devices. I personally have used ext2/rfs on my drives and it is a pretty light security system ;)

I would expect Apple's driver to be open source, so someone could just port it. Their HFS+ driver is open source.

There's no such thing as "closed" or "open": something can be open source (copyright law), but patented (patent law), and it can be closed sourced, but not patented.