My knowledge isn't very good here, but I assumed since they're using the single thread executor, everything was being spawned on the main thread. The only time

My knowledge isn't very good here, but I assumed since they're using the single thread executor, everything was being spawned on the main thread. The only time new (temporary) threads were created was when calling `spawn_blocking`. And the main thread can't be moved because it's part of the `main()` call stack? Maybe...