But who is supposed to decide if not you? I mean, even if the archive allowed original fic (and I hope it won't) it would still not be a place where you could put everything you ever created, because otherwise it would not be a fanwork archive at all anymore but a social webhosting space where people put personal archives of whatever and share tags and a search engine. You would still need to decide which of your things you could archive there and which not. To restrict archiving fic to things authors themselves see as "fanfic" is not any different.
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Yes, this!