Maybe you are reading too much into it. Banks have alert triggerings of all sorts. Ie:
- Amounts significantly over the usual for your profile.
- Abnormaly high number of tx's.
Not this for sure.
- Origin/destination to flagged accounts (ie: Accounts completely blacklisted, suspicious accounts, Bitcoin exchanges?).
Most likely this, as Dabs suggested.
- Tx's to/from other countries (this one is the main one when it is not clearly justified considering your informed profile).
Impossible. I routinely wire abroad, similar or larger amounts.
There are several reasons why banks NEED to do this:
1- To protect themselves from huge fines for not supervising money flow in accordance to KYC/AML and other regulations they are subject to.
2- To protect clients from having their funds extracted by hackers, etc...
3- To know what their clients are doing to detect trends and business opportunities.
Good point. Given the hoops I have to jump through to order a transfer, I would exclude 2, at least in my case. 1 and 3 are the most likely. In case of 3,
Hello? Is there anybody in there? Did you get it? Yes, that's right, I'm buying "crypto"

! Ah,
which "crypto" you ask? Hm... this is reserved info. Would you like some paid counseling? As if I were, say, a bank?
(I actually am a bank. My own.)What do you think would most probably apply in your case for having triggered a confirmation alert?
They probably have Kraken pre-flagged and will have made phone calls to the taxman already. Well as long as I don't sell I'm fine. And no, sir, I'm not selling at this time.