I won't be saying much about my personal experience with DCA but it's a good strategy to accumulate bitcoin if you are not very rich or have enough capital to lump sum at once.
DCA can also have a bad side, if you end up buying too much at very high price like during the bull and you end up with a higher buying average for lesser coins, so it's also nice you mix up your dca with other strategies to keep you well ahed in your investment.
The DCA strategy is absolute unique, being applied with no chances of affecting one's cost of living. Much is not expected to be wholesomely invested, it goes with little fractions that later on builds into bigger portion of what becomes in our portfolio. Maybe not just the DCA alone I have also learnt a few other strategies that can aswell be compiled with the DCA method to achieve greater results.
Investing in DCA method seems to me to be a simple and recommended strategy. There are many of us who cannot afford to buy a large amount of bitcoins at once but buy bitcoins in fractions through this method. Those of us who invest in the Dollar Cost Averaging method have a specific goal in mind which is to invest in Bitcoin with whatever money we have left over excluding our necessary expenses, be it monthly or weekly. There are many investors or members who regularly invest in DCA method. By investing in this way we can grow our investment portfolio if we do it patiently for a long period of time.
You seem to be mis understanding DCA, it has nothing to do with if your rich or poor, its major purpose is to reduce the impact of marker volatility on your asset since you would be buying continously at different markets prices.
Your right when you said DCA is a good strategy to accumulate bitcoin for a long term cause you can end up accumulating more bitcoin at a lesser price than someone who lumpsum often, let's say you've got 100k to invest in bitcoin and you lump sum right away, you would be buying your bitcoin at a fixed price and your profits woudl only come when the trend is bullish from there, if a bear comes you would be at more loss. But if I am using DCA then I'll split the money into equal parts, maybe for 4 buys, 8 buys or even 10 buys and I'll be buying at different market price and if its bullish from my first buy and bearish later I would still be buying bitcoin at those different market trends but where its bad is when you buy at the highest points of the market and then you stop buying when the price starts retracing down you would end up with ahigher buying average.
So the DCA is only best for continous buying and not for buying only for a short period of time, cause the DCA strategy can only reduce the impact of volatility as long as you continue using it.