Addressing to your point directly, the project doesn't claim to be open-source https://github.com/appbaseio/abc#licensing and the same is also mentioned in the blog post. The part of the project that is open-source is available at https://github.com/appbaseio/abc (but isn't relevant to the post here).

The import functionality is based on the transporter project[1], and to set the record straight - we will be adding the acknowledgement for the same in the next binary release[2]. However, we are not redistributing the source as `abc import` isn't open-source. For anyone interested in why we aren't straight up using the transporter project as is, there are changes we have introduced in the 1.) sink functionality, 2.) added adaptors for SQL variants and CSV, and 3.) made a more simpler interface. Going forward, we are more interested in the easiest way to sync <X> to Elasticsearch, which is different from transporter's goal of a generic ETL.

I do appreciate you bringing this up. We're very much just getting this out there and want to do the right thing.

[1] https://github.com/compose/transporter

[2] https://github.com/appbaseio/abc/issues/77