I've heard this before from crypto boosters.
Shorting doesn't work that way: you cannot hold a short forever just because you think something is a scam. In order to short anything, you need to borrow it first, and that comes with recurring fees. The profit margins on most short plays are thin enough that holding a short for longer than a week or two would eat up fees. So just because you know something is a scam or about to collapse is useless for profitably shorting it - you also need to know when exactly that bubble is going to burst or you will lose lots of money.
Meanwhile, the market is full of people high on hype, loading up on the stock, and frustrating any attempt at a profitable short. Even when a short play is perfectly warranted (e.g. GameStop late 2020), people might barrel into the stock you're shorting just to fuck you. It's not enough for there to be bad news about a stock, it has to be salient to the investor class to get them to sell.
So no, shorting is not a way to "put your money where your mouth is".