I'm guessing the hint is in their wording, CryEngine as a service. They're looking to shift to making money off the engine from services they provide to developers (eg a marketplace for assets, or any number of a dozen other possibilities).
It's only for "indies" without definition of what indie means. It might mean that you have revenue under 10k for example and after that you will have to pay 30%, they haven't told any additional details yet.