Roblox provides a built-in function called :Kick() . When a server script triggers this function on a specific player object, that player is immediately disconnected from the game session. The Ban Method
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A ban requires memory that persists even after the server closes. Developers use to save a list of restricted Player IDs (UserIds). Every time a player joins, a script checks this list; if a match is found, the server immediately triggers the Kick() function. FE Ban Kick Script - ROBLOX SCRIPTS - FE Admin ...
The Ultimate Guide to Roblox FE Ban Kick Scripts Roblox scripting changed forever with the introduction of FilteringEnabled (FE). FilteringEnabled is a safety feature that prevents changes made by a player on their own screen from affecting other players in the game. Before FE, exploiters could easily delete maps, crash servers, or kick players at will. Roblox provides a built-in function called :Kick()