When I was applying for a house mortgage, the case officer was asking me questions about the ins and outs of my financial transactions relating to my investments, because I made multiple deposits in a short period of time. I felt like I was being interrogated and I was annoyed on why the need for that level of scrutiny. Then I remembered that criminals have used buying properties for money laundering, or their initial capital came from criminal activities. There is a posh neighbourhood near where I live, and I saw couple of rough looking families having a gathering in a restaurant. I'm pretty sure they live in that area as well, and if they are, there is a likelihood that they may have bought or are renting properties using dark money (not that rich, suit-wearing people don't do this either).