In reply to Vova Feldman.

While it's legit, it's also not expected. Why would a service for tracking php / WP / plug-in / theme users need my *email*?

As a user I would be happy for a developer to collect information based on environment / application information - but not personal data like my name or e-mail. So, as a user I would definitely not opt-in.

As a developer this really reduces the usefulness of the service: I'd be asking for data I don't want and (a lot) of users wouldn't want to give.

I hope the service does succeed, it's a really solid idea - but it would be great if you could consider allowing developers to request the data they want. Or offer pre-set levels.

The web-hooks also lead you to a legal quagmire. I'm assuming you have legal ownership of the provided data. The web-hooks expose that data to a third-party (the developer), who could as mentioned in the article sign me up to a newsletter I never opted-into.

While legal side of that can be swept out of the way by adding a sentence to the effect of 'you agree we can share your data with our partners' - as a user, that's another reason to opt-out.