I'll happily state publicly that I voted for this proposal but in this case the issue is that Homebrew/homebrew-core does not follow a GitHub Flow process but pulls binary packages in with a custom tool (`brew pull`) and generally relies on a rebase workflow which GitHub does not sign (understandably as it's modifying the original commit and would have GitHub signing non-merge-commits). I'm still optimistic we can figure out a way to do this in future.