The AGPL is an interesting idea in principle, but it is an ecosystem-level coordination problem if you apply it to libraries. Application that include those libraries also need to be AGPL which means any existing application that wants to use it must be re-licensed to AGPL and only use libraries that are AGPL-compatible. Nobody wants to be a first mover in that direction.
Plus it is untested in court just how far its provisions go.
Plus it is untested in court just how far its provisions go.