These entities all have similar names and share similar origins, having been started by the founders of Open Collective and incubated in the Open Collective ecosystem, but are independent nonprofits with their own budget, accounts, staff, board of directors, and mission. They each have a separate commercial relationship with Open Collective. [emphasis not mine]

Open Collective, Inc. seemingly has nothing to do with OCF shutting down and neither entity has claimed anything to the contrary.