Thanks for the comment.

Recruiters on linkedin ignore the "I'm not looking" setting and spam candidates anyway. Linked even gives them tools to do this! So linkedin doesn't fix this issue unfortunately.

You can reply to linkedin spam messages with the filteredreduced link. It's just text. Thats what i do.

Unfortunately linkedin don't offer an api to let me automatically respond to messages on their system. Now that would be awesome if they did!