Based on the thread a few weeks ago and the subsequent issue tracker discussion at http://bugs.python.org/issue25194, I just committed an initial version of a "Motivations & Affiliations" page in the developer guide.
When the site next updates, that should appear at https://docs.python.org/devguide/motivations.html (it's the last section in the main TOC, with the link appearing right at the bottom of the main page).
In the meantime, the diff can be seen at https://hg.python.org/devguide/rev/0f0ff7d19cfc
The first important section for core contributors is the "Limitations on Scope": https://hg.python.org/devguide/rev/0f0ff7d19cfc#l3.31
That section spells out:
personal best interests to do so
Sponsor Members, there's a financial transparency consideration, so we should be inclined towards filling out an entry
to want to fill it out as a possible source of client lead generation (either directly or via the PSF)
The second important section is the initial guidelines for filling out entries, which are written in a ReST comment: https://hg.python.org/devguide/rev/0f0ff7d19cfc#l3.77
It's hard to judge how well that initial set of guidelines is going to work with just the one entry, so I expect they may need to be revised as more people start adding their own entries. However, I figured it would be better to put the page live and have that discussion here as people start filling it out, rather than speculating further on the issue tracker.