I touch on this topic a bit in the Civic Cloud proposal:
I think an important dimension to a project becoming an “official” brigade project should be ensuring a complete technical handoff of the deployment process and accounts. That means taking projects to a point where the whole original dev team can cancel an their credit cards a disappear without the project’s online components going down, and that a new volunteer could show up and open a PR and the brigade can ship that without the original team
The norm these days is brigades can’t and don’t keep anything online after the original devs disengage, and that severely hinders our reputations in our communities and the good faith available to future projects