Ah you’re referring to the ”proprietary Enterprise Edition with additional features" (cited from the Wikipedia article").
Since we are talking about living without google and its proprietary services and software, this difference is important in my opinion.
I personally don’t have an issue when a company is providing commercial add-ons to a an open source product. Probably without Owncloud Inc. Own-/Nextcloud wouldn’t have been started or got as far at all. I’m working for money myself.
I believe on free software where free means freedom and not gratis. However, I’m not against paying for free software, but I’m against proprietary software gratis or paid version. I agree with this point of view.