aka sub-prime lending. this sort of thing has happened before, “buying on margin” in the 1920s, for the stock market. it didnt end well then either.
the way that laws work is that if you sign a contract, it’s legally binding - so if you take out a giant loan to buy a house & cant make the mortgage payments, you’re out of house and you’re liable to pay back the loan. you gotta read the fine print before you sign anything.