[qwerty9876]

It makes sense if the player is REALLY good at the game, ie. in the top 0.1% globally or similar. It serves as a learning experience. You will learn much faster by watching a good player compared to grinding the game and slowly discovering the same mechanics yourself.

You probably wouldn't watch some random kids stream of them playing football in their backyard. Now imagine Messi himself doing exactly that and also commenting it live, explaining all his tricks and his reasoning for every move he makes on the field. I bet you would be much more interested.