Investing in the DCA method is safer than investing a large sum at a time and it reduces mental stress. The DCA method is more effective for ordinary people who have limited monthly income and limited risk-taking capacity. Here they can gradually build a significant portfolio by continuing to invest small amounts. And in this way they move forward on the path to financial freedom in the long term.
DCA method isn't about safety but about the quantity of discretionary income at your disposal as an investor. If you've a large discretionary income available at the point you want to invest, then you can go ahead and lump sum and it's still financially safe. DCA provides a slow and steady approach to investing into Bitcoin and even when using DCA, if you're over aggressive in DCAing, you would not be too safe as you may not able to sustain it for long.
DCA method is typically made for people to be able to invest in bitcoin regardless of their financial strength and mostly for people who could barely have something left as discretionary funds because this method helps you buy and hold regardless of the price and condition of the market.