My guess is that is was the shareholders who elected him.
“Mr. Dorsey, who the hell elected you and put you in charge of what the media are allowed to report and what the American people are allowed to hear, and why do you persist in behaving as a Democratic super PAC silencing views to the contrary of your political beliefs?”
I directly own stock in quite a few tech companies. Have for decades. And somehow,I don't remember getting any letters asking me if I wanted the CEO to act as a far left activist and suppress and persecute all conservatives, using the company to push his own private feuds.
Conservatives own a lot of stock too, probably vastly more stock than your average BLM/ANTIFA terrorist.