developer of a GPL-covered program bound by the GPL?
developer’s actions ever be a violation of the GPL?
Strictly speaking, the GPL is a license from the developer for others to use, distribute and change the program. The developer itself is not bound by it, so no matter what the developer does, this is not a “violation” of the GPL.
However, if the developer does something that would violate the GPL if done by someone else, the developer will surely lose moral standing in the community.
No, because the public already has the right to use the program under the GPL, and this right cannot be withdrawn.