Copyleft isn't antithetical, see how many people are paid to work on the Linux kernel. I believe some other ecosystem software is also copylefted, like systemd.

Copyleft isn't antithetical, see how many people are paid to work on the Linux kernel. I believe some other ecosystem software is also copylefted, like systemd. And is building on top of the unpaid labour of SW engineers really a major part of the open source ecosystem? I feel open source is more a way for companies to cooperate in building shared software with less duplication of costs.