The problem is that they are charging a per-minute fee, and a fee at the same order-of-magnitude as actually running the tests. If you're offering cloud-hosted runners for $0.002/minute, asking that same $0.002/minute as an orchestrator fee for self-hosted runners is just insulting.

Charging for self-hosted runners is indeed not a huge deal, and I bet they wouldn't have gotten the same kind of backlash if they charged for it via a per-seat, per-run, per-gigabyte, or per-log-line fee. And if GHA hadn't been so poorly maintained...