Cutting thick cardboard with scissors is a good way to hurt yourself.
You need some strength and a sharp blade to cut cardboard with scissors, for a child, it can mean going full force. And the more strength you use, the less control you have, increasing the chance of hurting yourself. That's also the reason why dull knives are considered dangerous. Scissors are for paper, not cardboard.
This tool looks much more controllable, which means it is safer, even before considering the intrinsic safety of the mechanism, more precise, and more fun to use.
You need some strength and a sharp blade to cut cardboard with scissors, for a child, it can mean going full force. And the more strength you use, the less control you have, increasing the chance of hurting yourself. That's also the reason why dull knives are considered dangerous. Scissors are for paper, not cardboard.
This tool looks much more controllable, which means it is safer, even before considering the intrinsic safety of the mechanism, more precise, and more fun to use.