Some "scripts" aren't for the game at all, but are malicious links. A user might send you a link to a "script hub" or a fake Roblox profile to "add them". These links are designed to steal your account login credentials (your password and 2FA tokens).
Be wary of anyone asking you to run a specific script to "verify" your fruits. These scripts can be used to forcefully drop your fruits or trigger a trade without your full consent. How the Official Trading System Protects You Trade Scam Script For Blox Fruit Dragon Update
Scammers often use a combination of psychological tricks and actual game exploits to bypass the standard safety of the Official Trading System . Some "scripts" aren't for the game at all,