Because macs are terrible platforms for games. They have been very low end for a long time (m1 notwithstanding), and they have been killing off opengl, the only cross platform rendering API (before vulkan, which they don't support). Also their insistence on breaking changes means your back catalog needs constant maintenance. That's normal for app developers, but not gamedev. Oh, and if you do make the port, they will be about 1% of your users. Or less. So, to summarize, mac support is expensive, difficult, and not profitable. Should we still do it? I tend to think you're better of spending your time on linux support.