The cryptocurrency market is developing, that is why there appearing more and more ways to get profit. Some of them are easy and can be used by newcomers, and other ones are only for professionals because they require a lot of experience and are a bit risky.
To start with, you need to know that when investors short sell bitcoin on a crypto exchange, they sell a Bitcoin they don’t possess. To do that they borrow bitcoin from exchange margin lenders, while the position is open.
The whole point of going short on Bitcoin is to sell the asset with the hope that it will be redeemed soon for a lower price.
Here is an example: you sell borrowed Bitcoin when the price is $10,000. The price drops to $8,000. You repurchase the Bitcoin for $8,000 to return it to the lender.
And you make $2,000 ($10,000 - $8,000) out of thin air!
Honestly, this isn't a verified way to trade at all. You cannot just expect that you can short instantly and earn for approx. 2,000USD by shorting bitcoin. Honestly, no one would ever lend you with a bearish market, as even lenders know how to trade as well, hence they are also aware that lending in a going down/red market would simply making them take the risk they never wanted. Trading, whether you buy at short or long, isn't an income out of thin air. Trading is a gradual income, which doesn't really give you time to breathe air at all, with the risk and tension with the volatile market.
Also, do you know that there are really less lenders that gives that huge 1BTC to anyone. Goodluck if you would found one, online.