Yeah, I'm no GitHub apologist, but I'll be one in this context. This is actually a not-unreasonable thing to charge for. And a price point that's not-unreasonable.

It makes sense to do usage-based pricing with a generously-sized free tier, which seems to be what they're doing? Offering the entire service for free at any scale would imply that you're "paying" for/subsidizing this orchestration elsewhere in your transactions with GitHub. This is more-transparent pricing.

Although, this puts downward pressure on orgs' willingness to pay such a large price for GH enterprise licenses, as this service was hitherto "implicitly" baked into that fee. I don't think the license fees are going to go down any time soon, though :P