Older Red Hats had a default ls which didn't do colour.

Then RH started aliasing the ls command to do colour anyway. In the
release notes for the release which did this, it told you how to undo
it.

The "how to undo it" has now fallen out of the release notes, and
"how to do it" is still a FAQ in the appendix.

I think it would be more sensible now to have a FAQ about *undoing*
colour (for single users and for all users), or to remove the question,
since colour is there by default now.

The reason why people might want to undo it is that some people
change their xterm/gnome-terminal colours or make them transparent
and then the colour can produce illegible results.