[@Expendable] magic is an accepted part of the the natural world in this setting. Your questions keep centering around magic and science as opposing forces, but in this setting they are not. Magicians didn't come out, because they were never hidden.

I recognize the instinct to try to fit everything together, because you're right that the world would be drastically different if magic were real. But the premise of this roleplay is that magic is just another part of modern life. I know there are aspects that are unrealistic, and if I were trying to make a movie or publish a book I might try harder to address them. 

As Naomi points out, yes, anyone can use magic.