Because they're not signatures they are included by MUAs in every reply.
That reply typically goes back to the list and another list footer is
added, that also then gets quoted.  See
http://lists.edlug.org.uk/pipermail/edlug/2017-February/000431.html

The list footer should be intended to be a signature.  If the user has a
signature then that will precede it and just increase the one
signature's size and it will all be stripped in the reply, which is
desirable.  Many newcomers to mailing lists aren't aware of the
signature convention so Mailman should default to using one and explain
what it is and why.

-- 
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https://bugs.launchpad.net/bugs/266269

Title:
  Default list signature blocks do not follow good netiquette

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