You must not use DCA method, but whatever method applies to you at any point. We're in Christmas and most workers here receive handsome Christmas bonus attached to their pay, such a person can decide to front load with those benefits since it might be considered his discretionary income.
Of course, since it's Christmas bonus using the money to buy bitcoin right awa is good or you can divide it into segments to buy bitcoin weekly with DCA. I have already been paid my Xmas bonus yesterday and I was lucky to lump sum with half part of the money at 98k+ and the other part, I have divided it into equal parts to DCA with in 10 weeks.
A poor person can hit a jackpot from lottery, or thereabout and have a lot of discretionary income at his disposal and in that case, it's better to lump sum rather than keeping the money and possibly ending up using it for unnecessary frivolities. At every point in time, it's very important to appraise yourself and determine the best accumulation strategy to employ in your journey as long as you don't get overly aggressive which is sometimes detrimental. The goal remains having more stashes of Bitcoin in your portfolio and hitting your accumulation target faster.
That's is solely on luck and what if the poor man was never lucky to win the jackpot. It's better the poor man uses that money that he's using to gamble to invest in bitcoin because it's an amount that he can let go if not he wouldn't gamble. Many people are saying that poor people cannot invest, and that's because they use their extra cash for irrelevant things that will not add value to their lives. Such as drinking, gambling, womanizing and to show off. Such funds can be channeled into bitcoin for the future instead of spending it carelessly and wasting the opportunity in front of you to invest in bitcoin with such funds.