Montreal (and presumably inspired from elsewhere) are moving to car weight as a metric for pricing parking permits (begin of a trend in that direction, I think).

Although they do use different thresholds for EVs and ICEs, not to penalize EVs.

They mostly wanted to tackle the problem of lost space from larger cars, and would have taken car dimensions if the data was available, but apparently weight and size often correlate (previously they use car cylinders, but nowadays there are huge cars with tiny motors).