What matters is the union of the monopolizations of the various parts of the software stack you depend on; parts with no monopolization can be ignored. "Open Co

What matters is the union of the monopolizations of the various parts of the software stack you depend on; parts with no monopolization can be ignored. "Open Core" is irrelevant and neither bad nor good, what matters is the required non-open part on top. Now it might be good for the vendor by letting them and their competitors avoid some duplication of work, but this isn't about the vendors...