Wrongfully tagged as community Wiki?

I recently encountered some answers that were made into community wiki by their authors for no apparent reason. There are no visible revisions, and it's the only answer, so:

• Why would someone make their answer into a community wiki when there is nothing "community" about their answer?

• If I encounter such answers, should I flag them for moderator attention?

• Of course, no offence meant to WillJagy, it's just the latest example. – nbubis Nov 23 '13 at 23:19
• CW can also be used to mean "credit waived," in the case that an author doesn't want to gain reputation points from the post. – user61527 Nov 23 '13 at 23:22
• @T.Bongers - perhaps, but that's not likely for an answer which was at $-1$ votes – nbubis Nov 23 '13 at 23:27
• Sometimes I make an answer a community wiki for various reasons. And it has happened a number of times that to my surprise an answer became a CW for mysterious reasons (not too many edits). Perhaps a bug. Not worth flagging, moderators have enough real things to do. – André Nicolas Nov 23 '13 at 23:39
• It happened to me once that an answer was unintentionally CW. I attributed it to the rather awkward way to write responses on an iPad at the time (could have accidentally checked the CW box). After that there's no going back. – WimC Nov 24 '13 at 11:55