>Given that we run these tests on every commit, in some sense, it would be the PR author's job, but if they get stuck, we need someone who's able to help them fix that. That is the hardest part of moving from tier 2 to tier 1 in my personal opinion. Who is that person? What happens if they drop off the project?

I would have liked to volunteer as the kind of person that would investigate issues for the FreeBSD platform but as I said, both my skills and my time are limited to the extent that they might not be sufficient.

As for what happens if the person responsible for this drops off the project, I think the solution to that is not so complicated; demote the platform back to tier 2 until someone else (if anyone ever) steps up to take over the responsibility.