  The recent measurement by LHAASO of gamma-ray emission extending up to 100s
of TeV from multiple Galactic sources represents a major observational step
forward in the search for the origin of the Galactic cosmic rays. The burning
question is if this ultra-high-energy emission is associated to acceleration of
protons and/or nuclei to PeV energies, or can be associated to PeV-electron
accelerators. A strong Klein-Nishina suppression of inverse Compton emission at
these energies is unavoidable, nevertheless we show here that inverse Compton
emission can provide a natural explanation of the measured emission, and that
an association to the established PeV-electron accelerating source class of
pulsar wind nebulae is also rather natural. However, a clear distinction
between different models requires taking into account multi-wavelength data,
having good knowledge about the local environmental conditions and, in some
cases, to perform multi-source modeling.
