Anything labeled as "passive income" is always too good to be true. There is no such thing as something for nothing IMO.
If you are interesting in investing, I wrote an article about a Cannabis company I am following.
Check it out: https://steemit.com/money/@cryptomeeks/a-marijuana-stock-i-am-watching
Not if you check the fundamentals on what a arbitrage is and the big price differences in BTC price. There is no free lunch because there is some more risk involved. But for me, the risk/reward ratio is good enough. It's online for several years now and is still paying me BTC. Oh and regarding cannabis, it' one of the worst asset classes to invest in now. Valuations are going nuts and de charts look horrible. Only (future) cannabis company I had a swing in was Pyxus (out now), P/E is still attractive but chart is not looking good. I made a article about cannabis for over a year ago wen it was attractive and out of the radar (I'm short Tilray now): https://steemit.com/investing/@unknowncrypto/smart-investment-buy-marijuana-stocks-today
I shuffled through many companies and found one that was reasonably valued for a cannabis company. They have a plan for growth, have low debt, and have a growing balance sheet and income. Not just a "dotcom" company. Check it out and tell me what you think.