Software freedom is about more than the license. You give up your freedom when you depend on someone else's cloud applications. In bold, at the start of the po

Software freedom is about more than the license. You give up your freedom when you depend on someone else's cloud applications. In bold, at the start of the post, is "not all functionality available in v3 is available in v4". That by definition cannot happen with free software. Whether there is a practical business case is a different question (whether or not it is profitable to build a business on top of Google Sheets is distinct from the question of which freedoms you give up in order to do so).