Datasets:
Hope You know what you're doing.
You're waking the sleeping giant by publishing an AO3 scrape here. Fandom is VIOLENTLY anti-AI right now.
Expect to be fighting DMCA takedown notices for the next century because once word gets out, everyone and their brother is going to be coming for this data. When fandom gets mad about something... ask app developers that try and make a profit off the archive.
This isn't a threat, honest, this is "Are you sure you know what you're in for once this gets into the general fandom zeitgeist?"
I believe this is a (common) misunderstanding of how such takedown notices work. Those go to the platform (here, HuggingFace), not the users, and THEY are the ones who decide whether or not to remove the allegedly infringing material. He COULD get sued though, but that's far more often an empty threat than actually carried out.