Some scammers use scripts to lag the game during a trade, making it impossible for you to click "Unaccept" before they remove their pets.
There have been reported exploits where hackers could steal pets currently equipped by players in public servers. To stay safe, many players recommend using private servers or not equipping your most valuable pets in crowded public areas. Verification & Safety Warning
Never invite strangers to your bank. Hackers have historically used bank exploits to steal IDs and rejoin to take items.
Avoid using "free models" from the Roblox Marketplace that might contain hidden "backdoors"—malicious scripts that allow hackers to gain admin access and download your place file.