There are several US Dollar ETFs:
https://finance.yahoo.com/quote/UUP and others. There are also ETFs on every major currency.
As far as holding thru previous bear markets, this is totally different. During the previous bear markets there was a very real risk of it dying/going away. The community was much smaller, the global name recognition nonexistent, no cme/cboe futures contracts, no robinhood/cash app, no bitcoin ticker on yahoo finance/bloomberg/everywhere else.
For the people who saw the price drop from $32 to $2 it was basically "well, it was a good run, game over". Nobody feels that way now.