I was about to comment that the proper spelling is MUNI but the I looked here [1] and they're spelling it Muni now? I can't seem to find anything written about

I was about to comment that the proper spelling is MUNI but the I looked here [1] and they're spelling it Muni now? I can't seem to find anything written about the change, while I find plenty of older documents with the all caps spelling. I wonder if some branding agency got paid for this brilliant idea. https://www.sfmta.com/muni-transit https://www.sfmta.com/muni-transit