Indeed. There's an argument to be made that asking someone to do unpaid work is inhumane (depending on the context). Personally, I put thought into my replies

Indeed. There's an argument to be made that asking someone to do unpaid work is inhumane (depending on the context). Personally, I put thought into my replies commensurate with the recruiter's message. Even if I'm uninterested, a thoughtful message deserves a similar reply.