Hopefully many of us are wanting to invest into bitcoin in order to have more options down the road in terms of 4-10 years or more, yet surely there are folks who will consider bitcoin as a trade on shorter timelines, and none of us can really persuade others in terms of the goals that they might want to have in regards to both why they got into bitcoin and the extent to which they might be striving to invest into bitcoin rather than merely trading it.
Yes, and for my personal experience, I never heard of DCA before, specially in the beginning of my "career" here back in 2017, all I heard by invest on it in the long term, and then the obvious be a trader so that you can earn from this market. But later on, I learn how to invest, I read others suggesting to do DCA to help me out, and then as I go along, there is a learning curve for me, choosing my options (e.g. weekly or monthly fixed amount), and then you will hear some saying to time the market. But with DCA you don't need that, but instead just be consistent and then buying more when the price goes down.
I have similar experience with you, the only difference is that you started way earlier than me and while you did more of trading at your earlier years, I did a little of that but I wasted my money investing in shitcoins, actions I still regret till date. My only consolation is the fact that I learnt the DCA method from this forum and started applying it, since then I have experiencing exponential growth in my Bitcoin portfolio. Indeed, the DCA method is organized and systematic and have this way of making the investor think more of buying than selling. The moment you consciously start applying the DCA method, you will be filled with only the thought of buying more and selling will never be appealing to you. I will not be surprised that the increased number of people owning Bitcoin now is somehow related to the popularity of the DCA method, although you should not take my word for it because it is just my reasonable assumption.