I've been using Pinboard for seven years. Signed up for another 10 years last year - it just works. Explain what you mean by zombie ?
By "zombie", I mean that it continues to function, but it's a dead product.
Support is often non-existent, and there's been no enhancements for years. If I were looking for the same sort of product today, I'd steer clear of it in favor of something that seemed more like its operator cared.