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As a corollary we deduce that axis-aligned cubes essentially \"maximize\" the $\\ell_0$ isoperimetric coefficient: There exists a positive constant $q > 0$ such that $\\psi_K \\leq q \\cdot \\psi_{\\mathcal{C}}$, whenever $\\mathcal{C}$ is an axis-aligned cube and $K$ is any measurable set. 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As a corollary we deduce that axis-aligned cubes essentially \"maximize\" the $\\ell_0$ isoperimetric coefficient: There exists a positive constant $q > 0$ such that $\\psi_K \\leq q \\cdot \\psi_{\\mathcal{C}}$, whenever $\\mathcal{C}$ is an axis-aligned cube and $K$ is any measurable set. 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