Second, while copyleft doesn’t get developers paid directly, it does at least given them a fairer chance to compete on more equal footing with big tech companies that would otherwise embrace and (closed-source) extend if it were permissively-licensed.

This is throughtout a group where significant members are in frequent communication. It maybe wasn't clear 30 years ago, but organization and centralization of contributors is arguably more obvious today. Equal footing would be able to demand more because of powers like unionization.

I don't even know if people who are primarily licensing would have that goal. It's seems common for someone in this type of position to already have really good career/pay options, they may not see a purpose for organization