Elsewhere in the letter it is described that Patreon employees had explicitly given approval for pornographic Patreon accounts, only to have this retracted late

Elsewhere in the letter it is described that Patreon employees had explicitly given approval for pornographic Patreon accounts, only to have this retracted later. I do feel that their point gets lost in the letter, but ultimately their complaint is simple; there's a niche market and niche opportunities for their specific groups to make pornography for their target audience, and very few means for receiving payment. Patreon previously was a good work-around for the issues with many payment processors refusing to allow pornography, but by being a Patreon campaign, they could avoid this. The letter signees were under the impression that Patreon was okay with this, but now Patreon is saying they are not. If the above is accurate, then I really get why they're confused and frustrated. I feel they're presenting things in reverse order or taking too long to get to the core point (they want to make porn as they had before without being penalized by payment processors), and Patreon was a solution that made everyone happy, though apparently something changed for Patreon.