The implanted magnets actually do tend to lose their magnetism over a few years, or at least I've read multiple accounts indicating so, eg https://www.theverge.

The implanted magnets actually do tend to lose their magnetism over a few years, or at least I've read multiple accounts indicating so, eg https://www.theverge.com/2017/7/21/15999544/biohacking-finger-magnet-human-augmentation-loss https://www.theverge.com/2017/7/21/15999544/biohacking-finge...