"Airbnb is [apparently] the easiest way for people to monetise (eh?) their extra space"
So basically it is taking lodgers into your spare room. So my answer to dick's question is "No". I would not accomodate a young muslim man or a woman in a burhka, nor would I accommodate anybody else of either gender or of any religion. I value my property too much, I don't trust strangers enough to do the same and I don't need the money.
As I see it Airbnb are facilitating the rental of people's spare rooms (for which presumably they receive a cut) and dictating to the owners who they do and do not accept as guests. Of course it won't be too long before a disgruntled Airbnb tenant moans that they have been discriminated against and off the circus will trot. So, thanks for the "heads up" on your "Community Commitment", Airbnb but I decide who stays in my house. So I'll pass on your kind offer to find somebody who'll pay me thirty bob a night to kip in my box room.