It depends on what the scrapers are using the data for. If 3taps had simply aggregated the data and created some neat visualizations showing relative housing pr

It depends on what the scrapers are using the data for. If 3taps had simply aggregated the data and created some neat visualizations showing relative housing prices across the country, that wouldn't be copyright infringement. However, 3taps used Craigslist's data to create a service with the same goal as Craigslist. This is copyright infringement.