You've got to be kidding, that whole sub is comedy gold.
Here's the story of a woman whose boyfriend moved another woman into the house and said "you can deal, or you can walk," so she meekly said "ok" and let the other woman take over an entire floor of her house. Then she's surprised when some months later the other woman is mad because the original girlfriend didn't leave yet, since the whole point was to push her out so they could be monogamous. And now she's wondering how to make herself trust that this is okay. That's comedy gold! How can you say that's not funny?!
Or how about this one, where a woman starts to date a man a decade older than her who has no steady job and likes to beat her up as part of sex, then the boyfriend gets a new girlfriend and uses the other girlfriend's money to pay for presents and dates for the new one.
Or how about this one, where a pathetic woman lets her boyfriend con her into a "poly" relationship with the nearly-ready-to-pop teenager he impregnated?
One of the stupidest and most destructive parts of the polyamory world is the "anyone can be poly" idea that applies even to people with significant mental illnesses.
Imagine someone saying "anyone can climb Mt. Everest! It doesn't matter if you use a power wheelchair or if you have a heart condition or you get exercise-induced asthma or you have vertigo." You'd be setting a lot of people up for dramatic, absolutely foreseeable failures.
But if you look in the polyamory subreddit, you'll find tons of posts where the OP has significant ongoing mental illnesses, sometimes several mental illnesses they need polypharmacy (heh) for. And no one says "hey, look, just like there are some activities in life you should only engage in if you know you are not physically ill or disabled, because otherwise they are very unsafe, there are other activities you should engage in only if you are mentally well and strong."
I know the reply here will be "hurr hurr none of them are mentally well," and yeah whatever, but there are levels of capability and mental illness. The fact that no one even tells the most obviously unwell people... people with long diagnostic histories of trauma-based disorders, personality disorders, autism, psychosis, and everything else..."hey, maybe not everyone is well enough to participate in these fuckfests" really gives the game away.
The people in this game who appear mentally healthy are actually predators who want to encourage mentally ill people (especially those with a poor understanding of boundaries and expected social behaviors/duties toward people you love) to enter the lifestyle in order to have fresh meat to exploit.