May be we should have inverse of all major actively managed funds. Per Buffet theory, this should always outperform market while not having limitations of passive ETFs and much harder to manipulate.
An inverse of all major actively managed funds will get you the same average performance before the fees (the same as the overall market's), but it won't dip into those managers' bank accounts and transfer their fees to you. It will charge its own fees. So it will underperform, too.
The management fee for this ETF, for example, is 1.2% per year.