Go to Binance terms and conditions on the Wallet when you want to import a private key. They are protecting your money if someone is trying to decode the transaction or public key.
You keep interchanging meanings of private and public key randomly. That leads me into thinking that you are missing a general understanding how things work. I would highly recommend to learn to avoid common mistakes and losing money.
Only if you share the private key they will not protect.
Exactly the point. Since someone else has the private key, this is no longer "your" wallet and so no longer your coins.