Not a whale, so here is hoping this won't be a problem. Just in case, what amount of cash is considered "large"? Their site says 1 BTC, in European banks they frown upon 2000-3000 EUR transactions, so I'm at a loss.
And what are the documents they can ask? They asked me the id, a selfie and a bank statement to check address, that's fine I guess? Same as with Wirex for example
Well, depositing of withdrawal of funds may vary but sometimes even it's just $1000 deposit/withdrawal could end up like the others. With other's experience this exchange ask aside from KYC, proof of address, source of funds, documents of other people who give/send you the funds like their ID, take note all transaction hashes are required too and etc.
It's all in google how they scam their users asking documents after another.
It's honestly hard to believe that a $1000 can lead to so many questions. Maybe this is the case of dirty crypto, that's why they're so strict? I'd imagine they'd want to make sure that the money is clean before letting anyone trade with them.