Yeah, I would argue that calling it counterfeit is completely wrong. Cassia and Ceylon cinnamon are both in the genus cinnamomum, so it's completely appropriate to call both cinnamon. Really, they're two very different spices whose flavors are only somewhat similar and have different culinary uses, but Ceylon cinnamon is less common in the US, so when we say cinnamon we pretty much always mean it to be cassia cinnamon- no deception or counterfeiting involved here.