You can see from the data that around the 15th of every month, $BTC can all manage to push up a big wave. This is because this period is close to the interest-payment date of $STRC , so some premium builds up; then MSTR sells $STRC , uses financing to make the buy of $BTC .

Once the interest-payment date has passed, some selling pressure gradually presses the BTC price back down. So MSTR decides that going forward it will pay interest once every half month, so as not to leave shorts too obvious an arbitrage opportunity.
Starting next month, interest will be paid biweekly, so between two interest payments, shorts only have less than 10 days to try to smash the market. If they fail to smash out a deep pit, MSTR’s ammunition is immediately reloaded—another bulldozer wave, with tens of thousands, even tens of thousands of buy orders.