The DCA method is not only for those who want to buy Bitcoins but cannot buy them all at once due to lack of funds. The DCA method is for anyone who wants to invest in Bitcoin. Everyone knows that Bitcoin market is the most volatile market. If you are a true investor, you definitely don't want your money to be lost after investing. To catch up with what you said I would have had to go back another 8,9 months and invest when bitcoin was $35k,$36k. But now the price has reached $70k! Now what if someone invests a large sum of money at once, and 2 days later the price of Bitcoin drops to $40k? Have you thought about that? I think no investor can think like that.
We know that DCA method can be used by anyone but however I'm a bit unclear on the aspect you mentioned that
if someone is a real investor they would never want to lose there money, are you actually saying that someone who invest on Bitcoin for holding may likely lose his investment on the process? Actually I need some clarification because if that's what you actually mean, it implies that you don't even understand the advantage of holding, you should actually understand that in holding no matter how the price will drop you can never be affected on your investment, perhaps I you don't really understand how it works let me explain it with an example, so let's take for instance years ago you invested when Bitcoin was $50k and it later fall to $26k there is no need to panic even if your investment depreciated in value but it will surely come back it normal price and even continue the uptrend movement, so truly there no need to be concerned about Bitcoin price because your investment is secured so long as you are holding, so try not to be thinking on that direction.