Eh while it sucks, registrars and web hosts get so many abuse reports that sometimes they just err on the side of caution and don't investigate as thoroughly as you'd like.
Of course it also depends a lot on various things like what type of complaint, how much money you spend with them, account history, complaint source, etc.
They should be able to tell you what they had a problem with and give you a chance to fix it.
Sounds pretty cool, thanks for the details! Any chance of some pictures? My worry would be the same, I don't know if I trust myself not to flood the house lol
I did think about using a mechanical float like in the back of a toilet, and an overflow drain in case it never stops filling