Just running a listing service doesn't mean the local realtors give you listings, that's why the Zillows etc needed to get access to the MLSes that they do use.

Just running a listing service doesn't mean the local realtors give you listings, that's why the Zillows etc needed to get access to the MLSes that they do use. Getting access equal to other brokers in the area, even if they weren't part of the good ol' boys network, was exactly why there needed to be an accusation of anti-competitive practices. Actually running an MLS is simple.