> Websites or services that act as personalized recommendation middle-men These are impossible without a legal precedent to make adversarial interoperability l

> Websites or services that act as personalized recommendation middle-men These are impossible without a legal precedent to make adversarial interoperability legal again. While it was never explicitly made illegal, copyright law and the CFAA have successfully been used to curtail it. Software that wraps common services such as YouTube/Facebook/Twitter/etc and added its own features on top (such as custom recommendations, etc) is routinely attacked and taken down. That's why there are no mainstream alternative clients for any of those services.