Hulk Hogan is right. I'm not gonna say anecdotes are really evidence or anything but I know a lot of poly people for some reason. I wish I didn't and when I meet new people who tell me they are poly it is a huge red flag.
Think about it; the way most people date, you are generally in one relationship at a time, maybe two or three casual relationships if you are trying to meet someone you want to date or you're a cheating shit. You also have a similar past where you were dating one person at a time. So your drama is limited to the person you are dating now, and the few people you dated in the past.
When you're poly, this multiplies exponentially. The drama never fucking ends. One of my friends broke up with 3 different women, all long term relationships, in the course of two weeks; breaking up with one person is hard enough, can you imagine breaking up with three? Like I said, the drama multiplies exponentially.
There are clear exploitation issues. One guy I knew was dating two women; one was much older than the other who was barely 18, to the point people thought the first woman was the second's mother. Both girls were free to date other people but the relationship was obviously exploitative to the point that the younger girl ended up literally running away and cutting off all ties to the couple. She was barely mature enough to be in a mono relationship, much less that situation.
It's not just men that use polyamory to exploit other people. In another situation, one of my male friends was dating a girl who decided she wanted to open up the relationship. My friend is a massive cuck so he agreed to it, though it pretty much only resulted in her banging a bunch of dudes she met online because he was a shy person who wasn't great at meeting women, which she knew. She didn't give a shit about him and was obviously just using him to pay for her apartment and lifestyle while banging other men. Eventually they broke up and he got into sex clubs, where he met a married poly woman. Her birth control failed and he got her pregnant, and she divorced her husband, and now he suddenly has a baby with this random sex club woman.
I know that sounds ridiculously over the top and exploitation can happen in any mono relationship. But I so rarely see remotely functioning poly relationships. Like Hulk said, poly people spend a shitton of time justifying being poly. They are emotionally immature. They don't understand moderation, and have an immature view of sex. They have broken lives they try to fill up with more people without improving the connections they already have. You can see this in people like Zayn, who admits to not getting tested for STDs, and my male friend. In an ideal world, it would be great to have whatever sex you want without any consequences; in the real world that doesn't work. Zayn, and my friend and many other poly people choose to ignore this in favor of short term satisfaction. It's very much an "I want everything and I want it now!" attitude.
I will say I know one functioning poly couple; I don't know much about their lifestyle because they don't talk about it incessantly like most other poly people. I'm pretty sure their gig is that they each occasionally pick up strangers at clubs, but don't juggle multiple relationships all the time.