Yes, that's my interpretation too. But with 90% or thereabouts (from memory) of sites using Google Analytics I'd wondered if anybody had a good way of getting users to opt in. As I see it, you're essentially saying to them "If you tech the tech tech, then we'll tech tech the tech. Enable tech?", regardless of how well you explain it, nobody will read what you say about it and it will always look like a security problem with the site and or stop them getting to the content they paid for. If I can go to a site and get free content, which in the past I'd have had to pay for, and they record what I did in order to make the site better and/or sell me stuff I might actually want to buy, this seems like a reasonable compromise.