Those people don't understand that buying Bitcoin for MicroStrategy's vaults INCREASES the value of MSTR for the owners of MSTR stock. Increasing value for the holders of the stock is also in fact Michael Sayor's DUTY as the executve chairman.
In the end, it's nothing different than Bitcoin ETFs, MSTR might be more dangerous than ETFs because they don't have any rule to own Bitcoin, so they can sell the coins whenever they want.
BUT if Chad Saylor decides to sell some Bitcoin, it would be in profit and what is his fiduciary duty as executive chairman of MicroStrategy? To increase value for the holders of the stock of the company, WHICH could mean stock buy-backs or capital allocation into other forms of investment that will be profitable for the company. Plus will he truly be a TROLL like Elon Musk? I believe not.