The community wiki option is not available to the question author, so it HAS to be done by a moderator.
And the user asked explicitly that their question be made Community Wiki:
This is not a question that has a single correct answer, so it should be a community wiki.
… which was entirely an appropriate application for community wiki, even if they hadn't asked.
The author wasn't asking for a specific answer to a problem. The author was asking for a list of suggestions. As such, no one answer is expected to be better than any other. The "value" of the question is in the entire list of answers, which makes it entirely appropriate (and expected) that the list be made a community collaboration. That's what community wiki is.