Because 2+2 and 2×2 both happen to mean the same thing: you have two groups of two.
3+3 and 3×3 aren’t the same thing because the first is two groups of three and the second is three groups of three.
2 isn’t the only number this works for, either.
It works for 0 (0 + 0 = 0x0. Two groups of nothing is the same as having no groups of nothing; it’s still nothing).
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