Actually even though DCA is just a method, but we can not presume that it can not do anything. As far as Bitcoin investment is concerned every strategy is good and  best suitable for you depending on how your source income and or your discretion can be able to withstand it. Any method is fine provided that it fits into your financial capacity. lets say a person may only chose to invest in Bitcoin using only the DCA method because he recieves payment every week or month and is able to source out his responsibility and also emergency and reserved, then he can also invest on weekly base on his programming. But if he the type that receive payment from contract like once in 3 months or 6 months then the person may only adopt the lump sum method. in this case such person can only figure out the suitable strategy that fits into his income source, from that he may do well in a long run if he can be consistent and focus. Nevertheless combining the 3 strategy is also good but will only be possible depending on source of income or your level of discretion. The matter is that we will find a more convenient way to invest and not getting tired quickly including adopting only one strategy depending on our situation.