Let's say I'm considering launching a website under a premium gTLD. Donuts is the register of this particular domain suffix.
I'm given to understand from this article and this blog post that Donuts can effectively charge what it wants when the time comes to renew a premium domain. Moreover, if the domain accrues in value due to the work I have done to generate traffic, this value can be partly siphoned off by Donuts in the form of increased renewal fees. In effect, a "ransom" situation.
Is my interpretation of this situation correct, and if so, why would anyone ever risk operating a popular or valuable website under a premium domain? (And hence by that logic, doesn't the designation of a domain as "premium" automatically make it less desirable, not more?)