Liberapay as an ethical alternative to OpenCollectives
I just wanted to mention Liberapay. (https://liberapay.com/)
I think is a more fair solution in comparison to OpenCollectives.
The platform is free software, available for self-hosting. (https://github.com/liberapay/liberapay.com/)
There are no fees for using the platform official server, beyond payment processors fees.
The development of the platform is supported only from donations, using the same platform (https://liberapay.com/Liberapay/)
The platform is backed by a french association (the natural evolution for any french association is to become a cooperative SCIC/SCOP)
OpenCollectives is backed by a classical company and it has a profitable business model behind the scenes. They already collected 3M from private investors. But they have the cheek to also accept donations inside their own platform.
I think a solution like Liberapay is closer to the values coming from the Platform coop movement.