In Figure in the ESI we show the mean-square displacement of centers of mass of the polymer chains as a function of lag-time. We first observe the sub-diffusive regime with scaling exponent ∼ 1/2 at short lag-times and eventually diffusive Brownian regime at large lag-times. Interestingly, these results agree very well with recent simu-lations of Liang et al., 101 who used the polymer model derived from the Kremer-Grest model mentioned above. We surmise, that the bond crossing of our model is rather rare event and it does not destroy the equilibrium dynamics, but one would have to be extremely cautious using this model to measure properties such as viscosity, shear modulus or probing reptation and structure of entanglements in interpolyelectrolyte complexes out of equilibrium or at high densities.