> I’d be more willing to pay if GH Actions wasn’t so flakey and frustrating (for hosted or self-hosted runners, I use both).

This is indeed a reason I do consider leaving GHA. The underinvestment into this part of the product shows. But they also did announce quite some investment into new and (for us relevant) features alongside the pricing change, so I'll have a look at how this changes with some sorely needed work on the product.