It seems to not be there now, but some months ago, patreon's entry page listed out the types of "creators" that one could sign up as. As I recall, this list seemed to take actual pain to not mention open source software, among an otherwise exhaustive list of creative endeavors including not just art, music, writing, but technical endeavors as well as such as research. I always took this to mean "programmers not welcome". This was about the time that there was a mass exodus of bloggers from Gittip (what gratipay was called at that time) to Patreon so they almost seemed related.

edit: finally got through their registration. You get: "Which category fits what you make best?"

Video & Film

Music

Writing

Comics

Drawing & Painting

Animation

Podcasts

Games

Photography

Comedy

Science

Education

Crafts & DIY

Dance & Theater

.. it's clear that programmers (unless you're a game programmer) are not welcome.