And the interest is compound, what means if you don't touch the money, you will also earn more and more income each new day, besides the increasements in bitcoin price. It's a much superior option to a traditional saving account or a fixed income investment (at least in comparision with my country).
The example you gave above is the dream of many around, including me. Unfortunatelly very few will achieve that because it's really hard to save 5$ million dollars considering the average wages and the expensive living costs for everyone. Anyway, I would be happy to be able to reach 1/20 of that monthly income you pointed in your post...
Oh yeah, I didn't even consider that, it's true, every day you are getting paid on that and you are going to end up with a lot more money as well that way. Compound interest is a great way to make a lto of profit in most cases and we are talking about doing compound interest on bitcoin here. I am 99% sure that there is a good chance that it is a lot better way to invest your money compared to any other nation in the world, there can't be any nation or any fiat investment that would offer a lot better money.
At the end of the day it is not a great way to make a profit in fiat because your fiat will keep on losing money due to inflation, my nation literally loses a shit ton of money to inflation. Freebitco.in is a hero for me, thanks to them I actually make enough money that would be above the inflation level in my nation and of course bitcoin itself as well.