I'm using it in opt-in mode myself, and I'd hope most people would too. You'll see I recommend that in the docs too. The first step is getting site owners to give any opt-in or out facility at all, which is why I didn't make that the default. I'm sorry if you think that's untruthful. I'll probably change the default based on the feedback here.
Yes, I see why your marketing sense told you to choose the untruthful version.