It is completely on-device only for the blocking part, so no data will leak to a 3rd party. It is #GPLv3 licensed and you can inspect the source code at https://github.com/confirmedcode/lockdown-ios
Bobinas P4G is a social network. It runs on GNU social, version 2.0.1-beta0, available under the GNU Affero General Public License.
All Bobinas P4G content and data are available under the Creative Commons Attribution 3.0 license.