They change your radius to 100mi every open – 3Fun: Threesome Couples Dating Review

Every time you open this app they change the radius to 100mi, even if it was lower before. This causes you to unknowingly appear in search results in areas you might not have expected it, and your potential matches wind up being much farther away than expected. This is deceptive behavior designed to increase the amount of profiles people see on the app and make it look more saturated than it really is. This might even be against App Store TOS.
Review by Jeftdthisthingwhat on 3Fun: Threesome Couples Dating.