Why is the BRRRR method in question right now?

[Lynn Belnap]

The title is the main question. But, is it because the market in an unknown state of prices of whether homes are going to be foreclosed on or not? Or is it because the banks have changed their requirements for cash-out refinancing. I may have answered my own question, but I still don't know if it is correct or if there is more to the story I am missing. Thanks.