I can't believe what I found, but I've come across an egregious example of abuse of self-moderation on this forum. The user with username "Excimer" has not only deleted some or all replies they disliked, but also completely changed the topic of threads and even moved them to different location. Here is the table of proof.
That member is part of my ignore list so I don't know what he is doing in forum, but he didn't abuse any rules with deleting of posts in his self-moderated topics.
If you really care about that you can easily find archive of all his topics with posts inside using Ninjastic.space website.
I would also suggesting using ignore button that can be very useful to avoid posting anything in his topics.