Device data (touches, accelerometer, etc) are exactly what I meant by compatibility. Again, back to my point of it not being finished. I see that it wasn't your fault, but this is misleading and shady.
But they're not "using" WebGL other than seeing a demo of it. There's absolutely no interaction. I bet at least half of your downloads expect they'll magically be able to have fully compatible WebGL games. Now that would be software worth paying for, provided it wasn't a settings toggle.
You're encouraging people to pay for this internal setting toggle, that Apple didn't default to 'On' for a reason (not being finished)? Where is the value in this? You are basically charging for Apples incomplete software.