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Here are my takeaway. Christian does sound slightly miffed at the fact that Voyager has copied much of the look and feel of Apollo. Even though he has not contributed any code directly to the Voyager app, he has indeed "contributed" to it indirectly. I highly doubt Christian will go after Voyager app in a legal manner. He definitely would have a legal standing to do so but that would alienate his support from the past Apollo community that has moved onto Voyager. There is just no reason for him to do so. I suppose I can imagine a crazy scenario where Apollo IP switches hands to another company and that company decides to take legal action against Voyager but that seems highly unlikely. In retrospect it would have been nice if developer of Voyager basically got permission or just simply asked Christian if it's okay to use the look and feel of Apollo in writing. That would have avoided any awkwardness or ambiguity.
Copyright has not been violated, and so he has no standing for legal action.
There's approximately 0% chance of that happening. Christian made up his mind, he's free to do whatever he wants. And we're free to do whatever we want short of actionable real lawsuits. Time will tell but the genie's outtathe bottle.