Rather than answering my opinion on each of those, I think I can do it with just one answer:
You could use those examples for just about anything, such as alcohol, guns, or anything else that the Buddha deemed unwholesome. The Suttas refer to those in the trade of meat, weapons, alcohol, etc. To me this means just the owners, not the delivery people, employees, etc.
So my opinion would be the owner of the unwholesome business and anyone who directly buys the unwholesome products, such as poisons for killing, assault weapons, alcohol, and then yes, meat. Unwholesome, perhaps unethical, not illegal.