We agree that you shouldn’t have to pay for materials you’re teaching! Our system notes that you're a TA or professor and marks your account as non-billable (note that the system also removes the opt-out button).
Although you don't see the Opt Out button as a professor, your students will see that grey opt-out bar at the bottom of the screen upon clicking into the RedShelf tool in your LMS.
If you get an email warning that you’ll be billed unless you opt out, you can ignore it - you just receive those emails as part of the class-wide notification. If you end up with a charge on your account, please let us know and we’ll take care of it!