The TL;DR is "I don't know, maybe".
We didn't actually get any proper reason, they stopped responding to my emails after a while. The flag was for "illegal content" so probably? I sent them the moderation log to show that we remove that stuff, generally for server takedowns
that's all you need to send since it proves that you don't actively harbour anything, but ah well.
I say probably because google tells me people get randomly flagged by them out of literally nowhere. Just like, blogs and whatnot suddenly told they're hosting illegal stuff. So I have no idea if that was actually it.
Reminder to use the report button lole, we've got like 4 of us checking reports constantly and can't do anything if people don't do it.