If I was Tim Apple, I would simply develop macOS and Linux to take away Microsoft market share then halt resources from Linux development to draw people to apple.

They have already done this. The LLVM toolchain (like the clang compiler) and zsh were implemented in MacOS to get around GNU and assorted copyleft programs.

Individuals moving to Linux won’t do anything. The only way for it to gain traction is is large companies not only declared their switch, but also request and/or develop the same proprietary bullshit like photoshop on Linux.

I think it's more nuanced than that. It also has to do with the fact that free operating systems are not in the supply chain. In a capitalist system, nonfree software is prioritized because of its rent accumulating behaviour and control. Only a socialist system could address the inequality inherent to proprietary supply chains. In order for this socialist system to work it must not start from scratch. Individuals moving to free software and understanding their freedom should be considered a vital part of a socialist education. Educating and agitating for free software and free software communities is more important (imo) than open source photoshop.