There is an unlimited amount of money you can lose when shorting stocks.
I don't believe it's the case, but what if Trump and friends are just wishing to play the markets and he will back off with tarrifs? We will see a massive short squeeze and lots of people taking huge losses.
Most trading professionals would not call it gambling if you have positive expectation and a process.
Positive expectation properly and repeatedly executed over time is a business.
Would you say a casino is gambling by offering table games to customers?
Most gamblers have a positive expectation and a process.