They have to follow the rules of money laundering agrements and while you could not provide the source of funds, the regulators give a shit about our past savings and they shot you off just like that.
It really sucks what happened to you and it should be a warning call to others but hey, look at the bright side. They did not confiscated your funds and let you withdraw gull amount in a week. That's pretty long imo. 

I'm definitely not a huge #Strike spender and I will keep DCAing each day in small amounts because the service is flawless in what I'm using it. I also withdraw sats regularly from them to my cold storage.