You use "open source" multiple times in the post, HN title, HN comments, but: 1. The source code for the project isn't shared anywhere. 2. The data isn't shared under any standard open source license. 3. The terms of your site explicitly prohibit commercial use of this data. So what exactly makes this "open source in the broadest sense"?
No, the source code is not available. This dataset is a subset of the raw data our system collects. Our final product made available via the API does a variety of processing steps on the raw data (dedupes, joins, ML predictions, etc). The final, processed data is the piece that is proprietary / subject to the terms.
We will update the site terms to reference this dataset, as we aim to continue releasing an updated version each quarter. I'll have to double check with the lawyers, but it will most likely be MIT licensed.