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The ease of using the DCA method must be accompanied by confidence, because this confidence will ensure everything runs smoothly without being affected by anything, because we are confident that no matter what happens, it will not prevent Bitcoin from continuing to rise in the long term.
Every investment comes with risk and the same applies for bitcoin too and you can never say I am 100% sure that bitcoin will be higher in the next 5 years from the current price and it will likely to be but my point is there's always risk factor in it which creates pressure for retail investors.
To minimize this risk they also should follow diversification, if they can invest $250 a month and no more than that then I recommend that $100 for bitcoin and the remaining for other things they consider potential too grow which reduces the risk and able to have a peace of mind even when the price of bitcoin is crashing because I can't imagine all my savings is in bitcoin and it is crashing 30% in a day will surely creates a panic situation that might force some of them to sell that will result in a capital loss and wasting few years of investing.