[palmer]

Same reason that applies to all government intervention in the marketplace: it will be used to prevent competition and innovation. In the case of transport and services, I would love to start a WISP in my isolated rural neighborhood and connect everyone with a social media service tailored for local interaction (one of my actual products). I would be stopped by your segmentation rule and worse, the established providers would use it as an excuse to stop the WISP from competing with their DSL, cable, and cellular wireless services.

It's a much worse problem with:
2. Directory/Search
3. Content

Those are always converging. Doing that will keep static definitions and protect current providers. Nobody will compete with Google. Nobody will compete with Facebook for user content. Naturally Facebook will keep their internal search features while hypocritically preventing any competitor from doing the same thing. The whole idea assumes that everything is just fine the way it is. But in fact the company that will overthrow Google will be an upstart that combines search and content.

[Mariner]

The rule would not stop you from building a WISP.

Only by bundling it with a social media platform would you run amiss.