Very very risky (I'm still doing it though). Some very skilled short sellers lost a ton of money on Tesla - for example Jim Chanos - a guy who predicted the fall of Enron and shorted quite a lot of stocks that turned out trash - Beyond Meat, Wirecard, Hertz.
But he closed his fund late 2023, in big part because of his short position on Tesla. He's still a very vocal advocate of Teslaq. Feel really bad for the guy - Tesla will end up crashing, but it will take way way longer that anybody could anticipated.
Note that you would have lost 91% of your money over the last year with this. Gambling on the precise timing of a stock crash is really hard to make profitable.
Plus buying an inverse ETF has higher fees than actually shorting it and you can't make a pair trade or earn interest on the money.