The machines haven't worked for me, so I just started opting out immediately as well, since that ends up being much faster. I don't understand the point of this.
There are some domain names that have requirements but nothing like you're thinking. The only one I would automatically consider as providing useful information would be .gov.
Depends on the sandwich. If you're constructing a sandwich without using heat, I would consider that "making lunch" or "making dinner" but not explicitly cooking. I'm not sure that the difference matters in any significant situations, though. Why are you asking?
If it's stuff you already own, the income would be based on the difference between what you paid for it and what you get for it. Likely, you're selling at a loss, so that's not income.
The machines haven't worked for me, so I just started opting out immediately as well, since that ends up being much faster. I don't understand the point of this.