Delta Chat@me subject lines are encrypted with delta since 2018 ;) for more info see https://delta.chat/en/help#message-metadata and the whole section around encryption.
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.