I just received a few long spam comments in the form of SEO advices. I wasn’t wrong to consider them to be spam content, but something looked strange. I tried to google a paragraph and it leads nowhere! Looking closer, I discovered what made the text “original”. The author used special characters to replace certain letters in the text, but avoided to replace the characters inside targeted keywords (that gave him away).

Examples:

κ instead of K 

ω instead of W

ρ instead of P

Is this a common technique to generate “fresh” content?