It's worse than unrealistic. It's ludicrous. Any company running more than an hour of actions workflows per week on GitHub can afford a few dollars a month for infrastructure. The per-minute charge is less than the cost of a millisecond of engineering labor time.
Dude why are you so determined to defend this pricing change? You're all over this thread arguing with people that it's not a big deal. If it's a big deal to them, why do you give a shit? It's not like it's your problem if people take their business elsewhere for a poor reason.
I realise 100% utilisation isn't realistic, but that still sounds very expensive when you're already BYOB.