- kill Padmapper instantly by building a map function to view their listings.
- elect not to build a map feature because they think it's trivial and they believe no one cares. So Padmapper should languish.
- buy Padmapper for a little bit of money and have Eric help make their product better.
- hire Eric to make their product better.
- invest a little money into Padmapper as a hedge and hope it does well.
- charge Padmapper a data access fee
These are all totally reasonable options.
Instead, Craig turned to the lawyers and sued Padmapper for using Google's listings and decided that all CL posts are now their exclusive property. If CL really didn't want this data out in the wild, they'd prevent Google from indexing their site.
This is not only a dick thing to do, it's an especially dick thing to do if you sit on the board of The Sunlight Foundation and the advisory board of Wikimedia.
Craig Newmark is a lazy monopolist at this point. All profit taking, no innovation.