I think this is no different than a photocopied signature from the CEO in a personalized letter. We have a Microsoft Certified Partner plaque with a Bill Gates signature that is a reproduction. I'm not losing sleep over it.
This is why we're desensitized to such signatures. Do we really want to be desensitized to videos that look like a recording of a human saying your name?
Next level is having that signature in blue printer ink. The next level above that is automating a pen to write the copied signature onto paper. The next level above that is to use a mechanical hand to grasp a pen and apply the same Bill Gates movements for the signature. The final level is cyborg Bill Gates itself.
I have done this. I hand wrote a letter, figured out how to match what was printed to the colour of the pen after it dried, and then just hand wrote in the names. I used blue so that it looked like it was handwritten.