+ as a bonus we'd also incentivize businesses to internalize their marketing and related tech operations (since sharing data with 3rd parties would not be allowed), same for AI-customizations etc., forcing them to tech-ify and become more tech-savy businesses instead of externalizing all such things to evil big tech (eg. a clothing store chain could compete not only by producing better clothes, but also by developing better monitoring and generative AI for human-in-the-loop hyperpersonalization, spreading tech out... instead of outsourcing these to tech or big-consulting companies as they do now when the too-little-data they so collect anyhow is otherwise easily share-able to third parties)