Just use PT3 or HEM. PT3 has a 2 month trial period and HEM has a 15 day period. It is safer that way, although I do not think you can get in much trouble if you happen to use sharkscope
but it is still better to not risk it and track it yourself. You will also get a more accurate representation of your game since sharkscope does not always track all the games.
But I do not think you will get into any trouble over this if you decide to opt in and use it but obviously not when you are logged in of course.