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I will review the recent paper arXiv:2406.17028. The authors suggest another mechanism for dark matter stability, Pauli blocking of dark matter's fermionic decay products. The authors analyzed the stability of the DM condensate against decays, scatterings (i.e., evaporation), and parametric resonance, delineating the viable parameter regions in which DM is cosmologically stable. In a minimal scenario in which the scalar DM decays to a pair of new exotic fermions, the authors found that scattering can populate an interacting thermal dark sector component to energies far above the DM mass. This self-interacting dark radiation may potentially alleviate the Hubble tensions.