There’s been a surge of interest in stocks of companies in financial trouble, most notably Hertz (HTZ), which filed for Chapter 11 bankruptcy and was dumped by activist investor Carl Icahn only to be picked up by many users on Robinhood and other stock-trading platforms.

The interest in Hertz has been so hot that the company asked and was granted the right to sell $1 billion in new shares of stock that are essentially worthless.

"What you're getting right now is this great disconnect between fundamentals and finance," said Mohamed El-Erian, chief economic adviser at Allianz, on CNBC. "Take Hertz. A company in a bankruptcy procedure that saw its share price go up....now they're talking about issuing stocks, warning investors they may be worthless."

On June 9, Hertz opened at $3.37 and saw highs and lows of $6.25 and $3.09, respectively, which represent massive swings over 80%. The whole week was like this, with moments during the day where the stock was up or down to a huge degree. Even on June 11, the flattest day for the stock, there were moments when the stock was up 7%.

Hertz isn’t the only stock like this; J.C. Penney, which is also in Chapter 11, and other risky companies, like Chesapeake Energy (CHK) have also had wild rides in the market of late. Chesapeake shares went from the low teens on June 4 to a session high of $77.50 on June 8 (around a 397% gain), finishing the week at just under $20.

Many see the trend as part of the narrative of retail traders, bored from a lack of sports and betting — potentially armed with stimulus money — to use the stock market as a casino.

“With the volatility, it is kind of like watching a sports game,” Barstool Sports’ Dave Portnoy, who has become a day trader, recently told Bloomberg.

Robinhood users love Hertz, for now

The latest trend of investing in bankrupt and otherwise distressed companies is standard day-trading on steroids. These investors appear not to be looking for long-term gains, but rather the chance that they will be on the winning side of wild volatility. In other words, they are speculating.

According to Robintrack, Hertz has been an especially hot stock for Robinhood users. Over the past week, the company has been the No. 2 most popular stock in portfolios. Only electric car company Nikola (NKLA) has seen a bigger surge. While J.C. Penney has been unavailable.

Robinhood users may love mega cap stocks like Apple (AAPL) and Amazon (AMZN), but they’ve also consistently shown interest in stocks with low prices, like Ford (F) and GE (GE), which are currently the top two on the company’s popularity board. GoPro (GPRO) is also in the top 10. Hexo (HEXO), which is almost a penny stock at a dollar per share, is currently in more portfolios than Amazon (AMZN). The lower the price, the easier to trade.