Actually the reverse is true. The law states it's ok, it's very obviously morally ok as they sold me the whole car, so I can't come up with any possible reason not to.
This is no different than modding an ICE to produce more horsepower when the manufacturer also sells a more expensive car with a bigger engine. It's not my job to ensure they make money.
Tesla's revenue generating choices are not my concern, I'm not responsible for their poor choice of business model (giving away 15 free kWh of battery to every 60 owner in the hopes that a few of them will pay for it later? batteries are expensive, that's a horrible model)