  In J. Shao et al., PRL 103, 108701 (2009) the authors claim that a model with
majority rule coarsening exhibits in d=2 a percolation transition in the
universality class of invasion percolation with trapping. In the present
comment we give compelling evidence, including high statistics simulations on
much larger lattices, that this is not correct. and that the model is trivially
in the ordinary percolation universality class.
