  Several laboratory experiments have published limits on axionlike particles
(ALPs) with feeble couplings to electrons and masses in the keV-MeV range,
under the assumption that such ALPs comprise the dark matter. We note that ALPs
decay radiatively into photons, and show that for a large subset of the
parameter space ostensibly probed by these experiments, the lifetime of the
ALPs is shorter than the age of the universe. Such ALPs cannot consistently
make up the dark matter, which significantly affects the interpretation of
published limits from GERDA, Edelweiss-III, SuperCDMS and Majorana. Moreover,
constraints from gamma-ray and X-ray astronomy exclude an even wider range of
the ALP-electron coupling, and supersede all current experimental limits on
dark matter ALPs in the 6 keV to 1 MeV mass range. These conclusions are rather
model-independent, and can only be avoided at the expense of significant
fine-tuning in theories where the ALP has additional couplings to other
particles.
