If a person has lump sum available, such as $1k to get started, and maybe he has an income in which he can buy $100 per week in bitcoin, then with the extra $1k, he does not need to invest through DCA, he could buy right away and/or he could buy at the dip (if the dip happens), so he has choices of the three different styles, and DCA is not always better if you already have a lump sum of cash come available to you. One of the reasons that so many people use DCA is because it is much easier to tailor some kind of a buying amount that goes along with their regular income coming in and their expenses, and so DCA also will allow an adjustment every week or whatever period that a person chooses to buy bitcoin under that kind of an approach/practice.
Yes, if a person has $1,000, he does not need to follow the DCA method, he can buy from the depths of the market if he wants. DCA will be a good method for those who will invest using the equivalent of $100 every week, but it will not be very effective for those who will buy from the depths. If I have a large amount of money at one time, then I will definitely reflect that when the market falls, and it goes down a lot, I will invest with all my money. If I can buy deep, it can show profits in a very short time, but if I use DCA every week with my money, it will not give much profit. So if you have cash, it is better not to practice the DCA method in investing, but it is better to buy when there is instability in the market.
normally the strategy your are using to purchase bitcoin doesn't matter provided you are investing in bitcoin for long term 4 to 10 years or more. and sincerely speaking there is no specific amount for DCA method, you can DCA with any amount be it $1000 or $100 all depends on your discretionary income, let's say your income is $10,000 for the week and after settling all your basic needs and expenses, there is a possibility that $1000 can be leftover to be your discretionary income, and if $1000 is leftover as your discretionary income you can use it buy bitcoin using the DCA method, instead of waiting for the dip, because waiting for the dip to occur may delay your bitcoin investment journey. And $1000 is not enough to lump sum because $1000 can't buy you good portion of bitcoin to hold for long term, and remember for you to make reasonable profit in return on the long run you need buy a good portion of bitcoin and hold for long term 4 to 10 years or longer.