From what I read and from what I have been told by other novel authors (grain of salt not my own experience). I probably shouldn't have said not well received and instead I should have said that they don't help in promotion (for novels).
According to some authors I spoke to, posting links for novels doesn't really do anything and if your account is mostly created to just post that link it can get you a shadowban.
You should have other type of posts to prevent such a shadow ban. If I recall correctly your promotional posts should not pass 20% of your regular posts depending on the amount of times you post. At least that is what a handful of novel authors have told me. Wether the shadow ban is true or not I cannot confirm nor deny that.
Without taking that into consideration they did tell me that self promoting a novel on reddit with links to different sites doesn't really bring any traffic or any new readers. Instead redditers prefer to read oneshots or follow certain stories created under a new subreddit.
A fellow novel author who is actually super successful posts their story on reddit and on RoyalRoad. I haven't asked them the details on how they self promote in reddit but I can pretty much guess their huge fanbase from Royal Road helped them promote their subreddit dedicated to posting the chapters of their novel.
Again this is not my experience. I did decide against self promoting on reddit (as a novel author) after asking several authors and finding out the reasons mentioned above. I won't post my novel on reddit since I am skeptical that every novel will have some form of success by posting full chapters in the existing subreddits. The author that is doing it is pretty much a unicorn. But I do know that posting oneshot novels on the right subreddit is well received (in general terms probably depends on the story) by the community.
P.S. The subreddit that the author I mentioned uses is r/HFY. They have a relative good success success posting each chapter in Humanity, Fuck Yeah! subreddit.