I agree a simple Black or white background can add to the image but nothing like helping someone to steal your work. As already stated, it is so much easier for tubers to steal and when some wants a white background, I would think it would be for them to do as they please with your image. Now if they pay for that right, that would be different. I rank all that as the same as someone charging you for the right to enter a contenst. The only one that benifits from that con is the con artist. It amazes me how many fall for that.