A user cannot write programs for MacOS without restriction by the company, e.g., prior approval, "developer" fees, etc. Adding emphasis on "without restriction

A user cannot write programs for MacOS without restriction by the company, e.g., prior approval, "developer" fees, etc. Adding emphasis on "without restriction" Opinions may differ but to me using Apple's "Darwin OS" is different from using a BSD project OS For one, I cannot install Darwin without also installing a gigantic GUI XNU, or XINU, stands for "X Is Not UNIX" To me, that giant Apple GUI is not UNIX