No not true... if you look at underlying value of your futures trade it's the same as buying spot or an etf.
You're looking at a short vix..., vix is more volatile than a normal stock, so that's already increased risk... but any short has unlimited risk. Whether it's a stock, ETF, Future...
Whether you short 125k worth of stocks or you short 1 es future... it's exactly the same.
I suppose you could say: a trader who holds a leveraged ETF throughout multiple trading days is not only making a directional bet on the underlying holdings in the fund, but is also making a bet on the path/choppiness (or lack-there-of) on a daily-basis that the pricing action takes on the way "there" (wherever "there" ends up being.)
Not something I care to wager on, personally.
More "choppiness" on a daily-basis equates to more "decay", and less choppiness with multiple days of "follow-through" in the same direction results in very fast compounding of gains or losses.
There's no free lunch though... some traders may seek to capture the "decay" due to "choppiness" by shorting both sides of a bull and bear leveraged ETF... but such is usually reflected in the high cost to borrow such instruments, and the generally high price of options on these products.
So it is different from buying leveraged etf risk which is dropping to zero only for the worst case.
I think you're being too specific for the more general query of the OP. He was speaking of 3x ETF in general I think...
With Vix ETFs / futures it's another world, because the contango effect is a lot bigger than in say normal equity ETFs and futures.
What 3x ETF do you rather be long compared to what futures strategy? Because there's a fair bunch out there. Are you talking about a long position in a 3x ETF VIX SHORT vs short position in VIX Futures?
CSp500 3x etf is an "ok" option while it has benefit from a trend market but not chppy, while you can put 100% cash in it without taking the more than drop to zero risk.
I think there's not much difference in equity. You will into a similar problem when having a 3x ETF valued at 100k vs futures valued at 300k... margin system will kick in and mean you will probably be forced to liquidate the futures before you're down 100k on those (assuming you have 100k balance to start with).
Negative of futures is that you're forced to roll them when holding long term. Negative of 3x ETF is costs associated with them... plus choppy decay...
When there is 1 day crash like 1987, future lost is instant without possible cut.