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I don’t remember all the details. They never went closed source, there was a difference in opinion between primary devs on the direction the project should take.
Its possible that was related to corporate funding but I don’t know that.
Regardless it was a fork where some devs stayed with owncloud and most went with NextCloud. I moved to NextCloud at this time as well.
OwnCloud now seems to have the resources to completely rewrite it from the ground up which seems like a great thing.
If the devs have a disagreement again then the code can just be forked again AFAIK just like any other open source project.
FWIW collabora and open office can integrate with other clouds like Seafile and owncloud Infinite scale. So even without NextCloud it can be used. It can also be used stand alone.