It is acceptable for everyone to buy Bitcoin DCA method weekly, but Bitcoin investment is useful enough according to the person's ability not daily to be self-sufficient.
Maybe you have not yet gained knowledge of the DCA system, not just invested in the DCA system that you need to buy bitcoin every week or purchase Bitcoin after two months, according to the investor's own convenience. It should be kept in mind that the only goal of investing in this manner is to buy Bitcoin regularly.
I noticed it started buying bitcoins from November 2020, but I think it is capable of holding for a long time. Because it is possible to hold Bitcoins depending on the situation, DCA method is the most convenient and easy to hold Bitcoins.
No, what you noticed is wrong because they started buying Bitcoin from August 2020. They are continuously investing through the DCA method, As you mentioned, the dollar cost operation method is the easiest for holding Bitcoin, which is absolutely true.
You can find out exactly when MicroStrategy started buying Bitcoin from this tweet.
For clarity, I was referring to the 21,454 BTC that MicroStrategy acquired, as publicly disclosed on 8/11/20.
https://x.com/saylor/status/1306692196041662466?t=AHCLREtNHF6uMGru_nESwg&s=19