http://yw7nc56v4nsudvwewhmhhwltxpncedfuc43qbubj4nmwhdhwtiu4o6yd.onion/t/why-we-abandoned-matrix-the-dark-truth-about-user-security-and-safety/224
Complete ownership, control and security of your data SimpleX stores all user data on client devices, the messages are only held temporarily on SimpleX relay servers until they are received. We use portable database format that can be used on all supported devices - we will soon add the ability to export the chat database from the mobile app so it can be used on another device.