This is even more confusing because the org behind Open Collective (opencollective.com) is called " Open Source Collective" whereas the org behind Open Source Collective (oscollective.org) is called Open Collective Foundation.
This post is unfortunately quite misleading : OpenCollective is not shutting down!
The news is just that the Open Collective Foundation, a fiscal host on the Open Collective Platform, is going to be dissolved and that collectives using this fiscal host will have to transfer their funds to another fiscal host.
Please be assured Open Source Collective is not affected and will continue to operate as usual. ... The similarity in our names stems from a common origin, as the founders of Open Source Collective were also involved in creating the fiscal hosts Open Collective Foundation and Open Collective Europe.
Profitability might not be the issue, neither are supposed to function solely to make a profit. From the linked blog post, referencing an email, it is stated that its costing more than the revenue can support.
From a general internet search:
c(3)'s can't engage too much (or at all) in legislative stuff but a c(6) can
c(3)'s are supposed to do things to help a group outside of itself while c(6)'s are supposed to exist to support their members
c(6)'s aren't required to report personal information of a person/entity making a donation to the IRS or public