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You can earn $1000, $10000 and unlimited number of money with trading but you have to calculate your chances here. How big is your capital? What's the chance of you earning $1000 profit per month? Income from trading is not consistent and there is a high chance of trader losing all of their money instead of regularly making the profit.
With large capital, you don't need to calculate opportunities like in future trading to get a profit of $1k in a month. If you have $10k as main capital, then you might just need to be a little patient to wait for price movements so you can make $1k. Strategy and capital are very decisive, even if you only focus on spot instead of futures.
I wouldn't say traders can consistently make profits every month in the same amount with a certain amount of capital, but you won't lose all your money just from trading, especially if you can avoid trading futures. Just try trading on the btcusdt pair on spot, this is also a good option to make a profit, especially when you have capital and understand the strategy.