You don't need to have a stable source of income before investing but somehow along the line, the stable income is still needed to maintain the steady cash flow that will continuously make you to accumulate more bitcoins because even as you invest within your discretionary income, if there is no steady cash flow it means your DCA will not be regular thereby it will try stagnate your accumulation process and the need to also have a stable income is so that you can remove the fear of market actions such as volatility but when you don't have a stable income source, at any slight changes in the market you will already start to shiver because it will look as if you don't have any back-up funds to ginger your morale during the time of constant market fluctuations.
Let's tell ourselves the truth. Having a steady flow of income plays a very important role in bitcoin investment, and this is the reason why investors can accumulate bitcoin. However, where there is no steady source of income, investors struggle to accumulate bitcoin because they need to meet daily demands. I think it is a necessity for investors to have a steady source of income, because for one to be able to accumulate bitcoin consistently without any challenges, there must be a steady source of income. Let us not sound as if every investor doesn't need a steady source of income to invest in bitcoin; it is possible that some may cope, but more income makes for better investment.
I think you should just understand the simple logic here, nobody is disputing the fact that you don't require a source of income, you need a source of income to be able to build an emergency funds and reserved funds to enable you protect your Bitcoin investment as well as to take care of your expenses, but to start an investment in Bitcoin or to keep accumulating Bitcoin continuously what you require is a discretionary funds, don't you think having a stable source of income doesn't guarantee you having a discretionary funds, for instance I have a stable source of income of 100$ on a weekly basis and all that 100$ goes to my weekly expenses of rent, phone carrier, and groceries, and gas, what of all that 100$ goes to expenses what discretionary funds are my left with, I will say nothing and I can't start investing or accumulating with this so called stable source of income.
Perhaps you decide to invest with your stable source of income it's more like you are gambling with your investment and I must say you plan to fail with that strategy.