I would also add Mirlo (https://mirlo.space/pages/about) Even if US based they are a coop (the company is managed by its members), and "allows for direct and ongoing support of artists. It’s different from other crowdfunding platforms because it:

• is rooted in mutual aid and is stewared by a worker co-op, which intends to exit-to-community as a multi-stakeholder cooperative;
• It’s open source and is working together with other similar products to build towards a standard-based and sustainable ecosystem."