If I was the TD or promoter I would explain that added money is not a charity. To play for it one must be willing to do what is required. Playing on a stream table when chosen is one of those requirements.
Simple.
Right, it could be a condition for entering the event.
Since the last few matches of each event are all streamed, can you imagine someone refusing at that stage?
Of course, a counterargument is that if you are going to make money off of my playing, I should get paid for it. My understanding is that Accu-Stats eventually compensates the players based on the sales of the DVD's.