settlers also has other connotations which is probably why is was chosen.
to settle something = agree
to settle down = calm and mature
to settle for something = compromise
to settle a dispute = legal and fair
None of which is remotely close to what these people are doing when they steal.
we talk about gremlins in a system.
bwg is a Welsh word that has come to mean creepy crawly, but also means spooky ghosty.