“Where do they get these names?”
You mean like “alternative right?”
Goes back before the Internet when you would get special interest groups with names like alt.ronaldreagan.die.die.die. The “alt” meant that this group was an alternative to alt.ronaldreagan.
Boy, was that dumb. And posted it twice.
The “alt” meant it was an alternative to SIGs with a more serious, or even academic, approach to a subject.