$850/year is insane, full stop. You are comparing $850 to a 5-figure cybersquatter, but they only steal your money once. ;-)
But the relevant (and desired) incentive with an ongoing price is that if the registrant is no longer utilizing the domain name, they are much more incentivized to dispose of it in favor of someone who will use the domain name if the holding costs remain non-trivial.
https://newgtlds.icann.org/en/applicants/global-support/faqs...
That's just the application fee, so that you can begin the process to (among other things) demonstrate you have the technical, operational and financial capabilities to actually run a TLD.