Where did you get this information that an investor gets 0.6% monthly? This is some kind of nonsense.
That's his example that for someone to earn $600, that investor should have at least $100k for that percentage of average.
Today, no one gets less than 15-20% per annum. In my country, even a bank deposit gives about 21% per year of the deposit. Now imagine that other assets give it. Therefore, you wrote complete nonsense that does not fit with reality. You should study this issue in more detail.
It varies to what kind of investment and deposits that we get in. In most bank deposits, it won't even reach 21% per annum and just like from 1% to 5% so that's even more unreal when you've said 21%. 15% is possible and lower of it are the typical rates for most but they're not mostly banking deposits that gives that typical rate.
All people are taking about passive investment because they saw videos on YouTube which is providing content to get views . They have no attachment with you because they want to get money by different things but actually they are earning best . Passive income is not easy as you are thinking because they need a lot of investment and for person like us that is not good and we have to learn more because we are job holders. we have money but don't have time to invest this money on best investment.Stocks investment is not an easy and all things always look easy from the away but we are close to that ,these are not easy and we will challenges to jump that.