Mine did more than 25,000, just get better tyres. The basic premise is that EVs are heavier and have more torque than average cars, but it's a 20% difference in real life, so your tyres may last 20% less.

Is it a linear relationship?

I know road damage is far higher (fourth power of weight) so maybe wear on tires is also worse than linear?

heavier vehicles are also worse in many other ways (e.g. less safe for pedestrians, require more space for parking,...) and we really should be encouraging smaller vehicles.