I'm sure that some people might have done it, but the media always likes to exaggerate everything related to Bitcoin. How often do you see the mainstream media report about how especially in Asia, people lose their entire mortgage loan on the stock markets there? I don't ever get to read or see anything about it in the media here, and that while the amount of money that people lost there is in the trillions.
The mainstream media sources are mostly all part of a main company listed on whatever stock exchange, so they don't bother to report about it because it would only work against them. People taking out mortgage loans will help them boast their stock value in the end. To add; more than half of the stock market is bought up with debt, which is quite worrying development. It's nothing new in the end, but the difference is that the debt to non debt capital ratio that's invested in stock market has exploded. It can't and won't end well.