What about: 0. Platforms may not customise information presented to an individual user based on knowledge the platform has about that user. I guess the issue

What about: 0. Platforms may not customise information presented to an individual user based on knowledge the platform has about that user. I guess the issue with that is how far do you go - a webmail client could be considered to be customising what each user sees, because each sees different email. However it's the level of personalisation which is the root of the problem. Perhaps instead: 0.b) Platforms may not customise advertising material presented to an individual user based on knowledge the platform has about that user.