You can federate services in ways that allow entities in different countries to control their own user data, while still allowing interactions between users in different countries.
Your private messages with other EU users might be stored only in Europe, with only Europeans able to access it. To the extent you message with people in another country, those controlling the federated service in that other country would have only the needed access. I don’t think this is groundbreaking technologically.
Your private messages with other EU users might be stored only in Europe, with only Europeans able to access it. To the extent you message with people in another country, those controlling the federated service in that other country would have only the needed access. I don’t think this is groundbreaking technologically.