The first kind of people are those who appear in your circle of life, especially close friends, colleagues, classmates, etc. You may be very surprised, because in your opinion, these are very good potential partners. If you feel this way, it can only mean that you haven't had a similar bad three-way hookup with them, or that you haven't even extended an invitation to a threesome to them. In the experience of quite a few people, it's not a good idea to have a threesome with someone you know well because not only does it greatly diminish the fun, but you also run the risk of ruining the friendship.
The second category is those you encounter on the app, users who steal someone else's photo. They often disguise themselves as quality users in order to achieve some untold secret, such as fooling people and selling pornographic photos or videos. They will carefully fill out their profile, leave some real contact information and upload some quality photos. It is these photos that will make you think they are the partner you are looking for, but if you pay close attention, you will find that they are stolen from other apps or websites. If you understand this, you are not going to get caught up in their pictures, and you will not waste time on them.
There's another category of people who do go for a threesome, but they usually have some crazy ideas, and they also have one of the biggest pet peeves, which is selfishness. They will make unreasonable demands of their partner in order to get their own satisfaction, and they themselves will make no concessions. So, if you become a threesome partner with someone like that, your date is destined to be a bad experience, might as well just skip them right from the start to avoid wasting your time and energy.