I don't think the existing permissive to copyleft spectrum is what matters here. MongoDB, for example, was previously licensed under the AGPL, which is the most

I don't think the existing permissive to copyleft spectrum is what matters here. MongoDB, for example, was previously licensed under the AGPL, which is the most aggressive OSI-approved copyleft license I can think of, but they still felt the need to adopt a controversial new license targeted at cloud providers. For another example, Redis Labs didn't decide to adopt a stronger copyleft license for their extensions, they decided to make them proprietary.