This phase is circuit agnostic, meaning that anyone who wants to build a SNARK circuit can use the outputs from this phase to bootstrap their SNARK circuit. This means that the output is a wider public good, which can be highlighted as a contribution from the Celo community to the larger cryptography community.
The second part of the setup, Phase 2, is more specific to the Plumo SNARK circuit itself. This phase will lead to the outputs that will enable proving SNARKs and verifying them. This is not a public good, and will be used specifically for Celo.