I guess the better analogy would be video games that are exclusive to a console ie. playstation exclusive or xbox exclusive.
There is an analogy here though: like a site refusing to run after detecting that your browser is running on Linux, such that if you fake that string, everything works fine.
Not true. Many years ago Atari patented a little cartridge flap just so no one else could make a cartridge that could be inserted into their platform. There are many other examples.