Comment by Seirdy

Software that isn't executed on a user's machine is out of the user's control. The GNU AGPL redefines distribution to include serving over a network so that software served over a network must disclose source code as well (unminified JS, server-side code, etc). It's also copyleft, which is good: the purpose of permissive licenses is to enable proprietary derivatives, which is against the spirit of the Fediverse.