Here's an explanation from their footer:
"Although Dewey invented his system in 1876, recent editions of his system are in copyright. LibraryThing's Melvil Decimal System is based on the classification work of libraries around the world, whose assignments are not copyrightable. The "schedules" (the words that describe the numbers) come from a pre-copyright edition of his system, John Mark Ockerbloom's Free Decimal System, and member contributions."
* Remove Jelly browser with `adb shell pm uninstall --user 0 org.lineageos.jelly`
* Disable F-Droid so you can't install another browser on a whim with `adb shell pm disable-user org.fdroid.fdroid`