I am a restricted member of someone else’s board, and it is no longer relevant to me. I should be able to remove myself from the board so it no longer shows up on my Dashboard, without the requirement to contact the board owner to do so.
Worst case the board owner could go MIA and I would be stuck with it on my dashboard forever.
Perhaps a function to hide the board by the user would be sufficient. That way it wouldn’t mess with any records on the board itself.