DOW ETF Short?

So many ultra etfs it can be confusing. Why does there have to be an ultra short ETF when you can short the ultra long one? Seems very redundant.

Also why does the russell need an ulra versions of it?
 
Quote from stock_trad3r:

So many ultra etfs it can be confusing. Why does there have to be an ultra short ETF when you can short the ultra long one? Seems very redundant.

Some funds can be long only. This way they still can be short of the market...
 
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