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The UK competition and markets authority's new report on 'online platforms and digital advertising' suggests that large shady platforms should share all kinds of personal data with smaller shady data firms via a linkable personal ID to increase competition.

This is a BAD idea.
Here's the report:
assets.publishing.service.gov.uk/media/5efc57ed…

It's not just a bad idea, it's simply unacceptable.

As I wrote months ago, when it comes to restricting platform power, perpetuating a hostile and broken personal data industry cannot be part of the solution.
Another intervention suggested by the CMA, letting consumers just sell access to their data, is equally bad.

PIMs may sound like a good idea in theory, but data self-management doesn't work. Predatory companies in all areas would just trick people into data sharing, like today.
The only acceptable intervention suggested by the CMA is data separation, i.e. banning platforms from using certain kinds of personal information across different services.

The report also mentions @johnnyryan's call for enforcing the GDPR's purpose limitation requirements. Yes.
Oracle, Verizon and smaller adtech firms want access to Google's location data. Publishers such as the Guardian want access to Google's attribution data.

Q to industry folks, do Google's existing third-party measurement partners not already have access?
measurementpartners.google.com/find-a-partner/
The whole report is 437 pages, covers many issues, and also includes suggestions worth discussing, from requiring 'platforms to provide consumers with the choice not to share their data for the purposes of personalised advertising' (hm) to operational/ownership separation (yes).
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