PierrePlease share how atproto is a proprietary protocol
According to the license file atproto is Dual MIT/Apache-2.0 License which you can view here: https://github.com/bluesky-social/atproto/blob/main/LICENSE.txt
Also included a screenshot
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.