Honestly, that person who didn't want the job on some kind of moral grounds just sounds a bit precious to me. Marketing firms all over the world are hiring people to help get the word out about their products online and very few of them are being as ethical as you are. I'm kind of baffled that someone looking for work had any objection at all. I just think this was an odd bird. I doubt very much that you will hear the same objection very often. I have never heard any objections about the process. The tasks are simple, straight forward and ethical. Just move on to the next VA... Which I'm sure you have.