Matrix: Federated chat E2E encrypted for 1-1 chats and possible E2E on group chats. Cares about user freedom and encourages writing software and clients to int

Matrix: Federated chat E2E encrypted for 1-1 chats and possible E2E on group chats. Cares about user freedom and encourages writing software and clients to integrate with Matrix. Possibly it's super private but it doesn't emphasize privacy that much. Signal: E2E encrypted with an emphasis on being super secure. Uses proven crypto techniques and doesn't allow unencrypted messaging I think. Does not allow and third party clients or integrations in the name of security, which does mean a restriction on user freedom. Telegram: Not E2E encrypted by default. Has an option for encrypted 1-1 chat, but otherwise everything is readable by the Telegram admins. Uses a homegrown encryption algorithm criticized by security researchers, but not known to be broken. Whatsapp: It's owned by Facebook do I need to say more.