I never said that artists that did requests were slaves. I wanted to say that people had the tendency to consider artists in general as their slaves. If you like to do requests, you are not a slave since you like what you are doing. But forcing people to do it is considering them as slaves.
I got nothing wrong with the ones that don't, but I tend to get frustrated, because there's been too many occasions where I get an artist to do a request or a commission for me, but after only one, two or three pics they suddenly just decide that they aren't doing either one anymore, and it's extremely frustrating!