It's because Blackmagic Design, the company behind DaVInci Resolve, have produced an iPhone app recently for shooting iPhone video which a lot of people (pros included) are raving about. Blackmagic Design also produced DaVinci Resolve for iPad before Apple did FCP for iPad and Apple actively promoted the DaVinci Resolve version when promoting the iPad Pro last year. Relations between the companies are interesting as the desktop version of DaVinci Resolve cannot read ProRes Raw which a lot of Resolve colorists would really love and FCP can't read BRAW (Blackmagic Design's version of raw video for their cameras) directly (there is a plugin now that does that).