Regarding airdrops and bounties, they have no guarantee that you're going to earn as much as $1000 there. Thus, you're going to need the equipment for you to start with it. And in that case, it's also qualified as an investment so, as you say that there's no need for an investment.

Well, in reality you still need it. The things you need to participant with those requires you gadget, internet connection and electricity. So, that's the investment and capital you need to have there.

But honestly, if you want to as much as that amount. If you're employed, you need to look for other side hustles that will guarantee you a profit/salary.

Also, you have to include the source for this thread.