I swear it's something about plugs and crumble cakes being more prone to mold than ribbons and flakes. People usually want to say mold is a C&D problem (and maybe it is), but I think at least part of the reason is that C&D makes a lot of cakes and loose plugs.
Seems like lately the moldies have been Briar Fox, JKP, Triple Play, etc. If somebody gets a molded tin of Black Frigate we might have a riot on our hands...