Guess some people prefer black and white to colour?
And that wasn't the question. The question was why? There must be some reasonable explanation, not some random or capricious decision.
A healthy human being has the ability to distinguish color information, and that was so important, pleasing, and valuable that despite of costs and trade offs associated with color processing compared to B&W, the demand for color cameras by far outweighs the demand for B&W ones so much so that practically all cameras on the market are processing color. Especially here on Fuji forum, where the importance of good color is so often extolled.
So in the light of that, it would be only logical to assume that there must be something really compelling to decide to deliberately downgrade the pictures to the B&W. I can't figure out any logical explanation based on those pictures. I know that all sorts of gimmicks are popular among the teens, for example, since they haven't yet developed good taste and understanding. But since I don't think it's the case here, I can't find any reasonable explanation. It looks to me a mistake in judgement and the pictures would have been much more pleasing to most viewers if they were in color.
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The trouble with Socialism is that eventually you run out of other people's money — Margaret Thatcher