Airbnb is not using Material Design. Baseline grid is different, text styles are different, mertrics/key lines are different, navigation patterns different. List goes on for days.
In the second paragraph on announcement it reads "As with last year’s winners, we’re highlighting specific aspects of Material Design used in creating apps which satisfy their users while appropriately expressing their brand.". I think the intention with Material Design, as many other design/ui systems (ie Bootstrap, iOS), is to provide a framework, not necessarily a design solution you need apply as is.
On the Airbnb app we actually do use some of the material design components and guidelines but have styled them to fit our brand.
Just to be clear, I am not saying “Airbnb is not material” in a negative way. I am stating that the name of the awards implies that the guides are followed very closely. IMO if your app is using core methodologies other than Google’s specific system of motion, typography, color, scale, tactile function, then it is just marketing slang to call it "Material Design." I'm sure Google even used portions and idea's from Airbnb's design language when building MD, but I doubt they'd market MD as using Airbnb design system.
So Google is holding a competition for who can adopt Google's internal styleguides to their external apps and websites?
Wow that header image is really, really hurting my eyes. So hard to focus on it! The colours, the blurriness.
.edit: that might be the worst image I've seen in ages actually what the hell!
.edit²: also, middle-mouse-click on the main menu (open in new tab) doesn't work. Stop breaking my default browser/OS behaviours!