Organizations this large typically have a team of people to deal with correspondence with those utilizing a direct email address for someone in this sort of role.
This is true, although there are many high-profile execs (Tim Cook/John Legere come to mind immediately) who have their assistants collate and pass on the 'best' or most thoughtful e-mails for personal responses.
A related story that's pretty funny: https://www.cultofmac.com/287261/reddit-user-convinced-tim-cook-change-apples-hold-music/