If a player joins a world for at least a first time, then that player would be controled by @i, even if that player left the game. It has the scan effect as @a, but can only find offline players. It may cure most of a devistating problem. If players are going rampant, giving out the OP virus (literally giving out OP to everyone), Leaving the game to be immune to /deop, just to rejoin to give more OP and leave again in OP permission, all that in one example. That gives some anxiety. I do know that most world owners and some moderators are too smart for that to happen. From the OP outbreak example, You should use /deop @i, and the true operator should provide a message of the outbreak, maybe offer them 16 budding Amethyst if for currency reasons in your server.
There are other examples. If there Seasons in a server, You can /clear @i (Especially with Ender Chests), /scoreboard players clear @i (and reset some to starting values), and provide a tag "seasons" to @i for a message.
If you're thinking of unbanning a person without turning command blocks off, even if a repeating command block is set to ban @a players tagged with "banned", @i would be perfect. If you do /tag @i[name="example player"] remove banned, example player would be unbanned.
Using @i may get laggy, so I recommend @i in Impulse command blocks, use for special occasion.
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