My experience with Bunq. My bank is not cryptofriendly so I had to use something in a middle to topup Binance with fiat. I have sent 100 and 500 eur instantly. After I sent 5000 euro and my account was blocked. Normally bank should have asked for documents to prove that funds are coming from the legal source. Not the case with Bunq. Not sure if they ever will refund my 5000 euro.
They don't like being used as a "transit" bank. (when you only transfer to an account elsewhere in your own name, or the other way around) They were about to close my account for the same reason a few years back. I've managed to convince them to let me keep using the account on the condition that I will use it "normally" as well. (I've promised to use it for payments with their card/paypal/SEPA etc, and I did) Try to negotiate with them in the same vein, it might work.
It's not the amount that is the problem, at least it was not back then. 5000 EUR is nothing, I've moved a lot more.