Ban personalized advertising!

Putting on my cynic-hat:

1. Reform occurs, now ad-networks serve ads based on the content it appears near, rather than analyzing the viewer.

2. Ad-network says "You know, I'd pay more if you had a version of this content that drew people who were X, Y, Z..."

3. The sites start duplicating their content into hundreds of inconsequentially-different sub-versions, profiling visitors to guide them to "what fits your interests", but it's actually a secret signal to the ad-networks.

4. Ad-network, super-coincidentally, releases tools that can "help" sites do it.