The pgloader project is fully Open Source and released under The PostgreSQL License so that anyone can easily contribute to the project. The whole project management (issue tracking, feature proposals, etc) happens on the pgloader github page, in public.
Software development may be open, and the result shared with an Open Source Software licence, but the actual hours of programming are not gratis.
Just like everybody else, I need money for mortgage, kids and food, money I make by doing things with computers, for people who are willing to pay for that. One of the things I do for money, is develop pgloader, and the pgloader Moral License is a good vehicle available for the paperwork. I shamelessly stole the whole idea from The Varnish Moral License. See the Varnish Moral License FAQ and How To to see how PHK does it.
If you have very custom needs and require more paperwork, of course that is still possible too, just get in touch at email@example.com!