Interesting list with a wide variety of sources people probably never even heard of. That being said:
Poloniex trading. Poloniex is a website where you can put Bitcoin or other digital currencies on it, and then trade them. I started out with five Bitcoins, I have seven plus Bitcoins today. That's a profit of about $1,000 by cashing out in about three months, which someone on my YouTube channel said: "That sucks Jerry, I made twenty Bitcoins on Poloniex in one month!" Congratulations!
I think it is very dangerous to so easily promote this to anyone as a way you made money. Investing in crypto when well informed is just that - investing. Putting money into Poloniex when uninformed is at best gambling.
People need to know that so they are careful and don't get burned.
You're right I just edited this with a better description of all of my trading on Poloniex to avoid promoting it!