The prinicipal of separation of concerns should be all you need for a legal reason for keeping listing companies like zillow from also participating in the mark

The prinicipal of separation of concerns should be all you need for a legal reason for keeping listing companies like zillow from also participating in the market. Clearly they are a company, company's only limitations are they exist to make as much money as possible for share holders and they have no morals, only regulations and laws limit their actions. Therefore they shouldn't be in the business of buying/selling houses if their main goal is to list house values, that is a severe conflict of interest.