I definitely understand this feeling, but I think in a lot of ways, the horse is out of the stable on that one. So many of the people who use AO3, even people who created it, are a part of the pro SFF scene, too, and many are outspoken about and proud of their fic roots (or current fic writing). I think it's still possible to keep an individual distance between your work (generic you) and pro spaces, but as a whole, we exist in a public way that is becoming more public all the time.

That is a hard transition for a lot of people, and I hope everyone can find their way to getting what they want from their fandom experience.

Fanlore's doing the dirty work collecting stuff for sure.