You actually describe yet another benefit of decentralisation.
Because this would certainly happen when the current movement of email into two major silo's (Gmail, Outlook) goes forward. When those two (or three, or four) have a majority of email-users on board, governments will start discouraging or forbidding usage of other mailservers. And will start making demands of those few leftover mailserver monopolists.
Because this would certainly happen when the current movement of email into two major silo's (Gmail, Outlook) goes forward. When those two (or three, or four) have a majority of email-users on board, governments will start discouraging or forbidding usage of other mailservers. And will start making demands of those few leftover mailserver monopolists.