$875 million would pay the salaries of 11,666 air traffic controllers for a decade at that wage.

You’re off by a factor of 10 here. It’s either a year of wages for 11666 controllers or 10 years of wages for 1166 controllers.

Do you really need signing if you’re using HTTPS though?

https://doc.rust-lang.org/nightly/rustc/platform-support.html

Tier 1 targets can be thought of as “guaranteed to work”. The Rust project builds official binary releases for each tier 1 target, and automated testing ensures that each tier 1 target builds and passes tests after each change.

https://doc.rust-lang.org/nightly/rustc/target-tier-policy.html#tier-1-target-policy

The target must build and pass tests reliably in CI, for all components that Rust’s CI considers mandatory.

Github is removing support for CI on that target, and since that’s a requirement for Tier 1 support the target has to be downgraded.