I would draw the line between platforms on the one hand and 3rd party products and services on the other. Examples of platforms: A phone operating system, a de

I would draw the line between platforms on the one hand and 3rd party products and services on the other. Examples of platforms: A phone operating system, a desktop operating system, a browser. Examples of 3rd party products and services: A site with apps reviewed and upvoted by users, a curated app review site, an app store that's not affiliated with the hardware or OS maker. Controlling the former offers real opportunities for anticompetitive behavior. You have buyer lock-in, and you can dictate the terms on which others may develop for your platform. You can push people off your platform when their goals conflict with yours. This is a logical place for some regulation designed to protect and promote a free market. With the latter, there aren't any special ways to be anticompetitive. By special, I mean distinct from the ways in which, say, a chemical company could be anticompetitive. Your example of a "nice little directory of apps you built" would fall into this category. No industry-specific regulation is warranted for this type of product or service, since you're not in a position to hinder the free market.