He didn’t follow any official legal process. He basically just released a proclamation, just like a King would do. He’s getting away with it because the other branches of government let him.

The President, as the leader of the Executive Branch, has wide latitude over what Federal Agencies do. It’s possible (but not a 100% certainty) that his Executive Order might bind Federal Agencies under his control, but certainly not the rest of us – not without legislation that goes through the normal process. It certainly doesn’t compel Google to do it. Now, Google may want to do it because they understand it can build political capital with such a small man, but that’s a different issue.

He’s done this before too. It’s still officially the “Department of Defense”, no matter how many times he calls it the “Department of War”, until Congress sends him a bill stating otherwise. Same with the Kennedy Center. He is doing shit like this, with no legal basis, on purpose, to find out who is “loyal” to him.