[RC2]

Are we now afraid to type the name “GOD”? Why “G-d”?

[mnehring]

That is normal practice when you see Jewish writings. It comes from the tradition that the name of God must never be destroyed, and thus, they do not write his name so it cannot be destroyed. It isn’t an insult or fear, it is more a statement of respect.

[MeanWestTexan]

Chabad is an Orthodox organization (of which I was formerly an active member).

It is a mitzvah to not destroy or defile the name of God, ergo it is not written out unnecessarily (especially on paper), as that may cause an accidental (or facillitate and intentional) violation of the command.