The professionalism of the celebs varies widely. Some can turn a 50 word prompt into a four minute, fun, natural video, others read instructions verbatim or fail to read the instructions at all
Yeah, I've seen a few. Some just read your words staring straight into the camera and some have fun with it.
The last one I saw, my friend said, "please wish my husband a happy father's day". She sent it to the actor who plays his favorite character on his favorite show.
The actor turned that prompt into a 30 second in-character monologue that was just brilliant. It was totally worth the cost just for the entertainment value to both him and the rest of us (she shared it on Facebook for us).