This is mainly due to the fact that so many recruiters have poor practices. I have a rule that if I'm contacted by a recruiter (unsolicited) I politely ask them

This is mainly due to the fact that so many recruiters have poor practices. I have a rule that if I'm contacted by a recruiter (unsolicited) I politely ask them to remove my details from their database. I label their email as unsubscribed and archive the email in Gmail. When I get a second email from a recruiter that previously has been marked as unsubscribed then I click that 'mark as spam' button. I've been doing this for eight years, since I'm quite happy with my work situation and have actively tried to remove myself from their databases over that time. However my CV still seems to be floating around, even though I've also deleted it from every online job portal I was signed up to. At some point most recruiters need to feel that pain, because they just don't listen.