Is it legal for an elevator card to only go to its own floor?

This is legal, because your home is on the same floor. What are you doing on someone else's floor? There are security problems, which are beneficial to community security and individual users. You think it's illegal, but you think it's restricted, which narrows the application scope of the elevator card. In public places, such as basements and underground parking lots, elevator cards can still be swiped. Therefore, within the scope of your home use, it does not infringe your rights and interests, so it is legal.