I went through all the questions tagged with copy.com. Each and every one of those 12 questions (the 12 remaining after you removed the tag from the post you referenced) is actually in relation to the now-defunct copy.com agent and client.
Because those questions are all using the tag correctly, and it's a significant number of posts (12 is not a small number of legitimate-tag-use questions...) I'm not comfortable removing the tag because the legacy questions that still use it are all legitimate questions.
To that end, I suggest you just remove the tag from the offending post you outlined.
I have made revisions to the tag wiki for that tag to indicate this tag should not be used, and is kept for legacy purposes in the interim.