Founder of Baserow here. Exporting to XML and JSON are the first features that we're going to move into the free plan of Baserow as soon as we have new premium features to replace them with.
GitLab, as an example, has been clear about having an "open core" business model[1] I appreciate that level of transparency. It gives me confidence that they understand their market and customers.
Naming matters. If a company can't or won't use the agreed-upon-by-the-software-development-community terminology on how the project is operated, it's souring to me. I also wonder if they (the company) understand what Open Source "is," specifically the responsibility that inherently comes with having an Open Source development/product model. In that circumstance, it feels like they have come to understand Open Source in the same vein that society once understood phrenology[2].
The TechCrunch article classified you as full open source but this doesn’t seem accurate.
It’s ok to be proprietary and charge money for licenses. The confusion is when the label “open source” is used for non open source software.