Yes, League of Legends has an HWID (Hardware Identification) ban system in place. This system is designed to prevent players who have been banned from creating new accounts and continuing to play the game.
When a player is banned from League of Legends, their account and associated HWID are flagged as banned. This means that if they try to create a new account and play the game from the same computer, the game's anti-cheat system will detect their HWID and prevent them from accessing the game.
However, it's worth noting that the effectiveness of HWID bans can vary. Some players are able to bypass HWID bans by using certain tools or software to spoof their HWID or create a new one. Additionally, players who share a computer or internet connection with someone who has been banned may also be affected by HWID bans, even if they themselves have not been banned.
Overall, while HWID bans can be an effective tool for preventing banned players from returning to the game, they are not foolproof and can be circumvented in some cases. Riot Games, the developer of League of Legends, continues to refine and improve its anti-cheat systems to prevent cheating and maintain the integrity of the game.