Well, updating. They answered in support chat that remaining funds will be transferred within few business days. I wouldn't say that there were a lot of big transfers. Rather many small transfers 100-200 Eur and few bigger 1000-2000 Eur.
Take into account most people use (most of) these accounts for small day-to-day payments, so a Bitcoin trader can be spot quite easily.
At the end of the day it's a numbers game. And if you're dealing with over a few thousands it's quite likely your account will be reviewed.