Handle ergonomics aside, because scissors aren't required to have ergonomic handles, you really want the nearer blade on the bottom so you can see exactly where the cut will be. A nearer top blade would overhang and obstruct the view of the cut line.
People talking about causing the paper to fold are either describing how they have subconsciously tilted the scissors to be able to see where they are cutting or the fact that many but not all scissors have handle shapes that curve wrong if held in the wrong hand so they end up holding those specific scissors oddly, which means that the scissors are no longer slicing perpendicular to the paper.
But handle curvature is not a requirement of scissors, just a characteristic of some of them.
If the scissors don't have ergonomically sloped handles, an ambidextrous person can comfortably cut with either hand if they don't look at what they're doing.
People talking about causing the paper to fold are either describing how they have subconsciously tilted the scissors to be able to see where they are cutting or the fact that many but not all scissors have handle shapes that curve wrong if held in the wrong hand so they end up holding those specific scissors oddly, which means that the scissors are no longer slicing perpendicular to the paper.
But handle curvature is not a requirement of scissors, just a characteristic of some of them.
If the scissors don't have ergonomically sloped handles, an ambidextrous person can comfortably cut with either hand if they don't look at what they're doing.