not sure who “they” is
The pip documentation, for one.
As for “the next line”, I should have said “the next few lines”.
Depends when/where it was copied from my original version;
I did strengthen the “don’t do it” message later on, IIRC.
I wrote it in the 2021-12-28 testing announcement, and expected problems to be picked up there.
Was working it out for myself, as I thought I might have installed some in system python by mistake.
Later in the process I found that pip freeze picks up packages that pip did not install, as you can read here
Years ago I followed the advice on pip.pypa.io and many other places, simply “pip install package”, which must be intended for Windows users, as it fails in Linux with a permission error. When it failed I simply used sudo, didn’t know it was dangerous. And last week I was forgetting that there had been malware on PyPI.