Yes, I understand that people will charge what the market will bear, and in this case Toyota has decided they can charge a lot -- because you bought the car and now they have you at their mercy. I was responding to the GP poster who explicitly justified it by the cost of operating the service.
This might not be a big deal if Toyota was the only company contemplating this business model (what's $8/mo, after all?) but I doubt they will be. If every product in your life adds a "small" subscription fee (calculated at 50-1000x actual service costs), things are going to get painful very quickly.