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.
For me I see DCA is for anybody that has a strategy 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.