That comparison really puts it in perspective when you say miners make approximately 450 BTC per day yet microstrategy alone was buying like 2000+ daily.   No wonder prices have been moving the way they have.   And their hodl technique absolutely contributes to the deflationary pressure as that's just a big quantity of bitcoin effectively removed from circulation. You're right though about the risk factor.  These institutions might possibly opt to sell at some point which would substantially impact the supply dynamics.   But microstrategy especially looks pretty devoted to their bitcoin strategy for the long haul from all I've seen.