If you mean Apple, it wouldn’t really make sense for them to do that. Apple primarily generates income from hardware sales, so they wouldn’t care if people run other software on the hardware they already bought.

Edited to say: this doesn’t really apply for the iPhone/iPad as the application ecosystem is locked down. macOS isn’t though so users will do whatever they want anyway. There are even tiling window managers for macOS!

The university is still named that way

I’ve never understood the need for fish. The shell experience is basically the same as zsh, and although it’s much more pleasant to script for, you miss out on compatibility with POSIX-compliant snippets, and besides, if you’re writing long and complicated scripts that need anything more than a handful of scalar variables you should probably be using Python (or Perl if you’re an old-school masochist).