Heyyyy, come on.
Where does it advertise that he is an demostrator or representative salesman for
Wersi?
If all the amateur videos uploaded at Youtube or elsewhere should be seen as a
officially demo for the brand used, it sure would drag most all away from being
sold.
If I happen to wreck a car because I cannot drive it, it's not the factory or
brand used to blame, only me.

Btw, he probably play for free to entertain some people, and as long as they have
fun and he have fun, so what?

Cheers
GJ