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@Dutch_Cheese
The function is to prevent the chain from dropping between crank arm and outer chain ring in case the chain derails.
If you're riding a geared bike, it makes sense when you're riding on rough surface, have your deraileurs badly adjusted, or shift in a brutal way (or a combination).
For a single speed it doesn't make sense, as long as you keep your chain line and chain tension okay.
If it's in the way and prevents the use of a chain guard, just remove it. Doesn't harm.