Why? There's nothing wrong with being a peasant. Salt of the Earth they are.
Besides, do you seriously think Crowley is not a peasant? :-)
Yeah right. As if many of them have had the benefit of a classical education and even give an antipodean lager about whether whoever cobbled together their logo picked the wrong word.
Come to think of it, maybe the wrong word was chosen deliberately, on the basis that at least some of the lads might know what arduous means, and might think that when the war was over they'd each get a nice Vauxhall as a bonus.