I disagree. Opt-out is the right approach, if you are using someone else's product you should assume you're interactions with it are being measured. It's beyon

I disagree. Opt-out is the right approach, if you are using someone else's product you should assume you're interactions with it are being measured. It's beyond quid pro quo, it's how software improves and evolves, and it is to the benefit of everyone: you, other users, vendor.