These are different strategies in accumulating Bitcoin. Some investors use DCA strategy, others prefer buying the DIP strategy, while some DCA and also reserves funds to also buy during the DIP and some accumulate with lump-sum (Rich folks). All these approach are decisions made individually with what suits our bitcoin investment goals.
It is not only rich folks that buy bitcoin with the DCA strategy; even a newbie can start his bitcoin investment with a lump-sum strategy in some situations. For instance, if a newbie starts accumulating bitcoin late, he or she can decide to do a lump sum buy on bitcoin to accumulate a good quantity of stash before the bitcoin price is too high, and he or she will continue accumulating bitcoin with the DCA strategy.
If a new bitcoin investor has a lump sum of money it can be easy for him to accumulate more stash in a short period of time. Basically if you want to invest in Bitcoin and get more profit, you should buy a lump sum. In addition DCA strategy allows you to regularly accumulate bitcoins which is the bulk of disposable income. If your floating money is sufficient. You may find it difficult to get dips in terms of investment so you can start accumulating bitcoins through DCAing. For a long time.