In my personal opinion what hurt piracy the most is streaming services like Netflix, Amazon Prime, and the various music providers. Cheap all you can eat media with no risk of lawsuits or viruses.
What is hurting porn producers, again in my opinion, is free tube sites giving away all you can eat porn. Models that just provide the wham bam thank you ma'am type shows are running up against free competitors, some even using videos of their own past shows against them.
This is pushing models that offer more to the forefront of the cam industry, because they offer something that prerecorded video is lacking. Interactivity, a sense of fellowship with the group, and so on.
I might be wrong, but that is how I feel about the industry as of right now. You can put sneaky digital signatures into every stream if you want, but putting a visible watermark with your model name and site might be much more effective use of your time. You also do not need the site you cam on to offer any technical support or money to make it happen.