opt-out spam

Hi,
I have collected a bunch of "opt-out" junk at the bottom of emails similar
to this one:

Not your thing? Just reply 'no tnx' to opt-out :)

Is it worthwhile to try and create a meta using these, or perhaps even a
fuzzy rule that matches on 'no tnx' or "leave", etc, in combination with
opt-out and those variations?