Would such a thing make sense. An ETF that buys crappy companies so that you can buy the ETF and sell it for tax loss purposes? It would have companies like Groupon,ANGI,FB etc..
Most tax planning customers want non-PAL ordinary losses. That has real economic value for taxpayers. An ETF that loses money will generate capital losses, which are generally worthless. That said, a strategy to lose money is no easier to execute that a strategy to make money. I imagine it takes the same insight to identify losers as it does to identify winners, and the success rate will be about the same.