I am a fool, and the 66 puzzle seems to have been taken away by a robot. I have no idea why this happened. Please tell me how to avoid being snatched away by robots if I crack the private key.
Yes, unfortunately it seems it has been snatched. At least
https://privatekeys.pw/puzzles/bitcoin-puzzle-tx directly states that. I don't know if they have proofs. And based on that, the original address is one of that was the target of the mocking transaction.
To avoid this you need to keep the public key (of this low range keys) in secret. Unfortunately public key is designed to be public, so it is not so easy to transact without making them public.
Option 1: Mine your own block or have a deal with a mining pool.
Option 2: Mara Slipstream. But Mara still can stole it in this case.