Some other things these companies look for:
- Whether you use actual clips/ scenes/ scans of their original work (I'm not)
- Whether you profit from it (I won't)
- What your purpose for your fanfic actually is (to tell this story that's been burning inside me for ten years and hasn't gone away yet; to fine-tune my artistic skills in preparation for original work).
I already assume that TSSC will not be on public display for a long time, at least after finishing the series, I intend to take it down. That said, in the meantime, if I'm asked to take it down by the appropriate authorities, I will. :/