Why is Steam (Windows PC version) the only program (to my knowledge) that natively snaps to windows displays?

Try it. Move your Steam window around. See how it snaps to the edges of your display(s)?

Why is Steam the only program (I know) that does that natively? I would love for ALL my Windows programs to do that (without installing 3rd party softwares/scripting).

EDIT : I'm on Win10.