Thanks for the compliment.
Yes, people post spun content on their PBN sites but I believe that it is not a right practice since it can lead to a strong footprint. It is very easy to detect which article is spun and which one is original. And imagine if all your PBN sites have spun content, it will be obvious for Google to think that you're using your PBN network for backlinks.
Hope it helps.
okay i didnt know that and i am not an expert.. thanks for correction @princewahaj