Just because it doesn't throttle services doesn't change the fact that internet.org gets to decide what services get on the platform in the first place.

"Developer participation on the Internet.org Platform, including the information submitted with your application, is otherwise governed by our standard legal terms . Collectively, our standard legal terms and these supplemental terms are the entire agreement between you and Facebook relating to Internet.org, and any terms of use for your service will not apply to Facebook. Submission does not guarantee that your site(s) will be made available through Internet.org."

https://developers.facebook.com/docs/internet-org