The user who is copying their own posts also will get permaban as per this comment by our global mod but sometimes,I am also reported some duplicate posts (the posts which is not accidentaly created twice the user posted the same reply in two different threads) but one of the replies got deleted only,no permaban for him/her too.
It's a permaban. This is no different than copying someone else's post and if you do this then you have absolutely no intention of contributing here and you're 100% only doing it to farm your account and/or bleed bounties whilst putting in no effort at all. It's scumbags like these that are destroying the forum. If they're too lazy to actually make posts then don't bother.