In contracts to Tesla and their approach, Porsche is interested in monetizing that service by charging an amount close to, or around the price of gasoline. A big differentiation between these two companies, is that Porsche will be rolling out 800v charging stations which is significantly faster than the options currently available at Tesla Superchargers. So it could be argued that with increased prices and investment, come greater costs.
https://www.gearbrain.com/porsche-mission-e-charging-costs-2549314338.html
https://www.gearbrain.com/porsche-mission-e-charging-costs-2549314338.html