I have spent twenty years working on open source sustainability, so watching a fight ignite between Ruby on Rails creator David Heinemeier Hansson and WordPress founding developer Matt Mullenweg this week felt uncomfortably familiar in a way I wish it didn't. David Heinemeier Hansson (also known as DHH) released a new kanban tool, Fizzy, this week and called it open source. People quickly pointed out that the O'Saasy license that Fizzy is released under blocks others from offering a competing Sa...