They can be real newbies with issues and need support, but they can be hired by competitor casinos for doing attacks ugly.
Is there any case where the account is clearly a shill created to tarnish some casino's reputation? How many of them happened in this forum? I never seen one where I can confidently say the account is targeting one or two casinos with solid proof. While it's not that hard to see it happen, I doubt smear attacks on this forum work that well honestly.
I don't think there are any examples where a group of newbies trying to post a bad image to a casino by putting false accusation against the competitor casino. Most of the time, i find newbies only come to this forum, complaining about a site, where they incur the loss and they are claiming casinos the reason of their loss.
Some people do post their genuine concerns too. I think we should take it case by case basis and if there are lot of scam accusation against any one casino, most probably there must be genuine issue with that casino.