Actually, the WPBA IS a player's union. The most important two things that the WPBA absolutely must own in order to continue to produce quality events for it's members are it's members loyalties and their media rights. Without either, you would be starting a new thread discussing the bankruptcy of the organization.
Live streaming is a benefit and a curse at the same time. The WPBA has a relationship with ESPN. That relationship is directly responsible for the amount of money the WPBA receives from sponsors. There are also issues with sponsors that may present a problem of independent live streaming of WPBA players. I'm sure there are exceptions, depending on the particular situation. I know that the WPBA does allow some live streaming. I don't know the specifics on how that works.
It's understandable that people want to be able to turn on their computers and watch Vivian and other players play, but in cases such as the WPBA, you have to understand that they are trying to keep a pro tour going for their players and it isn't easy, and most importantly, their tour players understand this.