You seem to have a misunderstanding of the DCA strategy in total.
The DCA strategy is not for poor people or for those with little income, it has nothing to do with how much you are earning the DCA strategy is simply dividing your capital into parts and investing or buying at intervals and this is done for some reason which is to.reduce the impact of volatility on yoir portfolio, you know that bitcoin is still a very volatile asset and to avoid situations where by you buy at a price and then the price dips and you portfolio would be at lose, but with the DCA method you get to buy at every intervals and price points so those fluctuations in price would not affect you, and why it is recommended here is beach it sis more beginners friendly and you don't need much knowledge other than to know how to buy and hold to get started with the DCA unlike the buying the dip strategy that involves some level of timing the market and more knowledge to be very successful at it. So yeah there is no barrier in using the DCA strategy.
I see that DCA is for anybody that has a steady source of income that can be able to accumulate as little as $5 to $10 per week because if you want to be rich I don think you would be able to accumulate. When you are talking about little income, you should be able to clarify the type of income. Each an everyone has its own source of income generation and the capacity it can carry . Provided that the amount he receives can be able to help him accumulate btc and emergency fund just like everyone has been saying in this thread, I believe he has to go. Everyone has the amount dey revieve it ranges from $50 $100 $200 $250 $300 and so on. In a situation where you receive any of this amount, you can schedule or program your self on how to arrange the DCA, emergency and reserved fund . So if you think you need to be rich before you invest in bitcoin then am afraid you are delaying your HODLing journey.
I don't think it's necessary for him to mention any amount as little income, reason being that what's little to you might be big for others and vice versa. It's is now left for the investor to determine which amount is to be considered little or that's appropriate for them to invest. Believe me if he mention any amount here as a base for little amount, there are people here who will quote him and say they disagree that such amount is too big to be considered as little. From the amount of money you listed above, there are people who are earning less than that, yet they are still making their DCA regularly. We shouldn't use the condition of things around and judge as the basic, there are people who live in countries where there minimum wage is less than the $50 you listed above. So when he said little amount, your condition of living will now determine what will be little to you.
One can use any amount he or she can afford to start accumulating Bitcoin with the use of DCA strategy. As long you are being persistent with it , beside ones earning can't be stagnant. So as your sources increases same goes with your cashflow, so as your Bitcoin accumulation should also what increase. For instance, Mr. A earnings was around $50 and Mr. A is an investor who's interested in , investing in Bitcoin Mr. A may decide to allocate 30% of his earning into his Bitcoin accumulation using DCAing, which means he will be purchasing $15 worth of Bitcoin every weeks . So if by any chances Mr. A earnings undergo an increment to $100 . He may choose to increase his allocation percentage to 50% while he use the other percentage for his emergency funds. His DCAing rate would increase, because he would then be purchasing $50 worth Bitcoin weekly . And it may also decide to use other strategy to accumulate more quantities of bitcoin depends on his situation at then .